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Well, after monkeying around with it, this is what I'd use:

 awk '{ print; system("sleep 0") }' edscript | tee /dev/tty | ed

or, without tee:

awk '{ print >"/dev/stderr"; print | "ed"; system("sleep 0") }' edscript

If print >"/dev/stderr" doesn't work on your system you could use print | "cat >&2".

With gnu sed:

sed -u -n -e 'p;w /dev/stderr' -e 's|.*|date|e' edscript | ed

Another way that works just as well:
Use split to split your edscript on each line:

split -l1 edscript

this will produce pieces like xaa, xab...xah.
You could then use the pieces like this:

for i in x*; do awk '{ print >"/dev/stderr"; print }' $i; done | ed

or

for i in x*; do sed -n -e 'p;w /dev/stderr' $i; done | ed

to get the expected result. Then you rm x*...

Well, after monkeying around with it, this is what I'd use:

 awk '{ print; system("sleep 0") }' edscript | tee /dev/tty | ed

or, without tee:

awk '{ print >"/dev/stderr"; print | "ed"; system("sleep 0") }' edscript

If print >"/dev/stderr" doesn't work on your system you could use print | "cat >&2".

With gnu sed:

sed -u -n -e 'p;w /dev/stderr' -e 's|.*||e' edscript | ed

Another way that works just as well:
Use split to split your edscript on each line:

split -l1 edscript

this will produce pieces like xaa, xab...xah.
You could then use the pieces like this:

for i in x*; do awk '{ print >"/dev/stderr"; print }' $i; done | ed

or

for i in x*; do sed -n -e 'p;w /dev/stderr' $i; done | ed

to get the expected result. Then you rm x*...

Well, after monkeying around with it, this is what I'd use:

 awk '{ print; system("sleep 0") }' edscript | tee /dev/tty | ed

or, without tee:

awk '{ print >"/dev/stderr"; print | "ed"; system("sleep 0") }' edscript

If print >"/dev/stderr" doesn't work on your system you could use print | "cat >&2".
The system("sleep 0") is there just to break the stream input to pipe. You could equally use something else as long as it doesn't produce any output and comes from a different source, e.g. system("date >/dev/null") or system("echo BREAK >/dev/null").

Another way that works just as well:
Use split to split your edscript on each line:

split -l1 edscript

this will produce pieces like xaa, xab...xah.
You could then use the pieces like this:

for i x*; do cat $i | tee /dev/tty; sleep 0; done | ed

and get the expected result:

a
hello
world
.
,n
1   hello
2   world
,s,o,O,g
,n
1   hellO
2   wOrld
Q

Well, after monkeying around with it, this is what I'd use:

 awk '{ print; system("sleep 0") }' edscript | tee /dev/tty | ed

or, without tee:

awk '{ print >"/dev/stderr"; print | "ed"; system("sleep 0") }' edscript

If print >"/dev/stderr" doesn't work on your system you could use print | "cat >&2".

With gnu sed:

sed -u -n -e 'p;w /dev/stderr' -e 's|.*|date|e' edscript | ed

Another way that works just as well:
Use split to split your edscript on each line:

split -l1 edscript

this will produce pieces like xaa, xab...xah.
You could then use the pieces like this:

for i in x*; do awk '{ print >"/dev/stderr"; print }' $i; done | ed

or

for i in x*; do sed -n -e 'p;w /dev/stderr' $i; done | ed

to get the expected result. Then you rm x*...

Well, after monkeying around with it, this is what I'd use:

 awk '{ print; system("sleep 0") }' edscript | tee /dev/tty | ed

or, without tee:

awk '{ print >"/dev/stderr"; print | "ed"; system("sleep 0") }' edscript

If print >"/dev/stderr" doesn't work on your system you could use print | "cat >&2".
The system("sleep 0") is there just to break the stream input to pipe. You could equally use something else as long as it doesn't produce any output and comes from a different source, e.g. system("date >/dev/null") or system("echo BREAK >/dev/null").

Another way that works just as well:
Use split to split your edscript on each line:

split -l1 edscript

this will produce pieces like xaa, xab...xah.
You could then use the pieces like this:

for i in a{a..h}; do cat x$i | tee /dev/tty; done | ed

and get the expected result:

a
hello
world
.
,n
1   hello
2   world
,s,o,O,g
,n
1   hellO
2   wOrld
Q

The downside is that each time the number of lines in your script changes you'll have to adjust the second command, i.e. if you have pieces starting from xaa up to xbg you would have to run:

for i in a{a..z}} b{a..g};; do cat x$i | tee /dev/tty; done | ed

It'd be easier with gnu split, using the -d (--numeric-suffixes) switch (though not portable).

Well, after monkeying around with it, this is what I'd use:

 awk '{ print; system("sleep 0") }' edscript | tee /dev/tty | ed

or, without tee:

awk '{ print >"/dev/stderr"; print | "ed"; system("sleep 0") }' edscript

If print >"/dev/stderr" doesn't work on your system you could use print | "cat >&2".
The system("sleep 0") is there just to break the stream input to pipe. You could equally use something else as long as it doesn't produce any output and comes from a different source, e.g. system("date >/dev/null") or system("echo BREAK >/dev/null").

Another way that works just as well:
Use split to split your edscript on each line:

split -l1 edscript

this will produce pieces like xaa, xab...xah.
You could then use the pieces like this:

for i x*; do cat $i | tee /dev/tty; sleep 0; done | ed

and get the expected result:

a
hello
world
.
,n
1   hello
2   world
,s,o,O,g
,n
1   hellO
2   wOrld
Q