At least in Germany this is already possible - the PW-5 has a handicap
factor of 86 (for comparison, a Ka-6e has 88, Std. Libelle 98, LS-4
106, ASH-25 124) .

In Germany, is the PW5 allowed to compete in club class?

In the US, we have a sports class, in which every glider can compete,
but the club class has been structured so that lower performance
gliders including PW5, silent, Ka6, Russia, Sparrowhawk, etc. are not
allowed to compete at all. One question before us is whether such
gliders should be allowed. After all, there is nothing in the rules
that says you can't bring a PW5 to a 15 meter contest if you want to,
it's rather curious you aren't even allowed to bring it to a club
contest.

John Cochrane