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To answer the second part of your question. How to mount a FS stored in two files (a and b) Two options I can think of:

Using device-mapper and loop devices:

losetup /dev/loop1 a
losetup /dev/loop2 b
s() { blockdev --getsize "$1"; }
dmsetup create merge << EOF
$(s /dev/loop1) linear /dev/loop1 0
$(s /dev/loop1) $(s /dev/loop2) linear /dev/loop2 0
EOF
mount /dev/mapper/merge /mnt

Using nbd-client + nbd-server

ln -s a part.0
ln -s b part.1
nbd-server 127.1@12345 "$PWD/part" -m
nbd-client 127.1 12345 /dev/nbd0
mount /dev/nbd0 /mnt

(easier but less efficient)