Can anyone build GPU vanity search for Onion V3 addresses?

There is cpu version: https://github.com/cathugger/mkp224o
And GPU version for v2 address which are old format: https://github.com/lachesis/scallion

I think it is very similar to these btc address generators. But underlying algo is different which is ed25519 in case of onion v3 addresses. How hard is it to port vanitysearch to do onion v3?