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If I created a channel via @herocast, what needs to happen in order for it to be usable on @warpcast?

building /hatsprotocol | 
proudly mid-curving it since 1995

Not on the near-term roadmap, unfortunately. All of the channel iteration we're going to be doing for the forseeable future will be centralized. If it's working, will move to the protocol in 2024.

What would happen if I tried to create a channel on Warpcast with the same source uri as the channel I created via herocast?

The source URIs in the permissionlessly created channels aren't configurable. Optimized for speed for iteration right now.

Channels are evolving beyond a simple FIP-2 reference