If you can have multiple writers to a single database then you'd need to look at something like cr-sqlite[1] that uses CRDT to figure out conflicts. If you're just replicating separate databases then you might be able to replicate each one using Litestream and then use SQLite's ATTACH[2] to connect them together. There is a limit on how many databases you can attach together in a session though.

[1]: https://github.com/vlcn-io/cr-sqlite

[2]: https://sqlite.org/lang_attach.html