I don't propose to psychoanalyze the boards of directors of IDPA, IPSC, and USPSA, but do have a suggestion:
I expect the match director for any routine club shoot will either give you an exemption and let you shoot your 7.62 or round up a loaner 9mm for you to use. I know I would, in fact I have. We had a guy shooting IDPA with a 6" revolver, and I have seen Makarovs in use. There is the guy shooting the 5.7 but I really do not approve of him because I know he owns a .40 and could abide by the rules if he had to. But the present match director does not make him, so he pops away with his smallbore.
By the way, what kind of 7.62x25 do you have? Tokarev or CZ52, I imagine; a long time since I have seen a Broomhandle in use.
Neither has the safety and ergonomics of a more modern gun so you will have to be extra careful, but if the MD goes along like I think he will, you can make a start in the sport.
Its a polish tokarev, been in the hunt for a 9mm barrel for it but those have dried up long ago and those who have them aren't letting go
I also have a mak..well a p-64 in 9x18 which I would also love to use (need to grab some more mags though) But i understand not letting me use that becuase it would be way low on PF.
Glad to know they might be flexable though... sadly the closest matches to me are over an hour away and I have to admit I would probably be a little dissapointed if I went and couldn't shoot
but hey maybe I'll just hop on the bike and takle a ride up and see what they say.
Also just wanted to say, I really don't care about playing for points or standing I would just love to give it a try for fun