We don’t know what they had. If the Kh-25MT existed and was tested, its highly unlikely to have been on the SU-17’s or MiG-27’s, more likely the Su-25T/39 which was listed on the report.
We have no idea what was passed on to the devs as a suggestion, but I doubt it was the Su-17M4/22M4.
I have no idea what is in them though, as they are in the German state archive and I cannot access it. There is also no pdf of them online, as far as I could find. One would have to go there in person.
while reading the sources, i found the fabled Su-22M5.
An upgraded version of the Su-22M4 which, by my understanding, was never undertaken. but there actually WAS 1 prototype!
and here is the cockpit for it!