Using gawk:
$ awk '
n=split($0,a, "oo\\+",sep){
for(i in sep) sep[i]="oo:";
if (match(a[3], /^.{8,}pkp/)) sep[2]="o:";
for(i=1;i<=n;i++) $0 = (i==1 ? "" : $0) sep[i-1] a[i]
}1'
Prabhjot Singh
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