come to think of it, it would be within the realm of possibility to design a server that accepts a connection from a Mastodon client and proxies it to a Nostr relay pool. this would be especially easy to do if NIP-05 addresses are used for all the account names, since those essentially work the same way way as Mastodon account names do. at that point, you're no longer really on the Fediverse, but it could certainly help lower the barrier of entry.