Let's do this:
Switch to your system, individual reward pools, but:
create SMTs at the same time, and have one working similar to the current hive token with a global rewards pool and without witness/DAO voting. This token should be airdropped 1:1 to current holders. This way the current users who like PoB will be happy and those who want to move away from it will also be happy.
If SMTs will take too long, then just create those two tokens for now, similar to how HBD has been created before. And delay SMTs a little more.