Well this is another different idea. But it seems fine in principle. Nostr could do checkpointing, for example. Why not.

An important aspect of bitcoin is that the emission was a level playing field. That has taken 15 years of track record, and millons of proofs. We are bout 96% done.

After emitting the coins fairly and as a level playing field, much of the hard work of consensus is done, the emission part. What remains is a robust ordering system. It is possible to innovate in that space, the harder thing would be to get universial consensus.