A bridge was already in the works. I think you can already find Blue Sky profiles on Mastodon (and probably here through Mostr) but Idk what the domain is, and the posts aren't bridging.
Discussion
Wasn't aware bsky was viewable on mastodon (I've never used Mastodon). Well it sounds like it sorta is anyway. This Skyfeed thing seems to be laying out specific plans for a proper nostr bridge (I think?).