Well, there are stuff possible like this
if you block C3A you can buffer 22B there, if they follow up with charge you get dmg, if they step release charge - charge it will be autoevaded by VE (most of the time it triggers VE autoevade) and you can punish. of course it doesnt beat throw/2A. but since raph has no convinient stuff like 1A or other characters.
but after C2A blocked you cant interrupt C3B, and you can only trade with C2B, so it is a little hard if you cant track her charges well. and 3~prep VE doesnt work quite as well, b/c VE starts too slow sometime.
Well there are some anti hilde strats with raph and he could be pretty nice against her if not doom combo.
But I find if funny that first people GI'ed charges on reaction. and now they can step) maybe next time you can interrupt it on reaction! ^_^