It's an interesting idea, but I think we're overlooking the human behavior aspect. These people don't necessarily act rationally, so a logical solution might not be the best one. I imagine they prefer to align with what is widely used by others, as it allows them to promote it at them.
That's just a matter of twisting the narrative: they loved the halving block, so why not start their own testnet Ordinal BS from the same hash as the halving block?