All I can say is, try to find a leather worker in your town and have him (or her) make one that works for you. after that, you might be able to market them to other hi-point owners. (with the maker's permission, of course...)
Good luck with your search, don't worry about getting flamed, at least you still own a gun and are serious about it's use.
One thing I will say, though is: go to a firing range and test that bugger, you need to know if there are indeed problems BEFORE you need it.