FYI it should be possible for any developer to update SQLCipher to SQLite 3.26.0 as described in https://discuss.zetetic.net/t/sqlcipher-sqlite-update/2470.
I hope to see this update on SQLCipher ASAP. While a patch on FTS3 should be good enough I would really favor a clean SQLite 3.26.0 update.
Someone also raised a GitHub issue in https://github.com/sqlcipher/sqlcipher/issues/297. I think this is the right place to discuss the wanted update but am not 100% sure.