I think both the novation and microfreak are pretty heavily interpolation based wavetables also, so likely they wouldn’t be of much use even if you could export. Arturia does seem to have a slightly better implementation though.
I wonder if that single cycle wave tool ess made would be a good way to put together an interesting wavetable, might be a pain to stitch together all the waves though. I might need to keep my eyes peeled for a good sale on serum just for making wavetables down the road. Honestly the built in waves cover a ton of ground I haven’t really found times that I am desperate for something that’s not in there for more traditional sounds. Would be fun to build some robot voice stuff with wavetable though.