I've cancelled my subscription yesterday, conveniently it was about to renew at the end of the week, so I have a few days to migrate from Proton, here's what I'm thinking of, but I'd love to hear what other people are switching to
It should work without, that was the original idea. But it is owned by Proton now.
If you end up having to create another SL account - this could be useful https://simplelogin.io/docs/getting-started/transfer-alias/