What about these synths? They’re free and there’s a Linux version, but not in a .lv2 format. I tested a pair of them in Windows (Apricot and Regency), and they sound good.
Would it be possible (and allowed) to convert them?
Strongly doubt that. I don’t see the source code available (which would be necessary to even look if compiling lv2 was possible) and not even arm64 binaries to download. If this was the case, there’s no clap support.