The HC > SVS conversion only works one way. I don't think there's any mod or other way to convert SVS cards into HC cards.
Not sure what your resources are, but sites like Bepis have separate HC/SVS sections for that reason.
Not only that, but huge dramas spawning literally hundreds of posts every day. Debates about questionable rules, people encrypting their links, archives getting reported/nuked, and various other stuff. It's probably better that it's gone. KK card sharing moved somewhere else.
This game isn't nearly as big as KK, as long as people behave, it's probably safe.
I haven't seen much specifically for SVS, but pretty sure there were a bunch made for HC that can be converted into SVS, you can probably find some on Bepis.
I might have some in my archives too (not made by me), I'll check if I can dig up something.