Thanks moecki :)

This would now also require multiple signatures and there is probably no operation for this (yet), is there? But that also means that other account data that require an active or owner key can no longer be changed? At least as long as there is no corresponding operation.

• That's absolutely correct. After we release the MVP, allowing account conversion, tx creation, and signing, we could look at adding extra consensus-based operations such as de-converting the account.