> I think you've identified some problems with the implementation, but I don't think that any of them apply to the general idea of using DCI.

Yeah, they're not points against DCI.  However, if the existing architecture can support PBS ineligibility, I don't think there's a need to introduce more architecture.

I've been writing up other ideas, though, and they all tend to fall into a DCI-ish pattern, so that may be the way to go.