Maybe the Senior, don't know the rules for the TT these days as regards Superbikes and homologation sales and all that. Are Honda willing to make and offer for sale enough to make them a "Superbike". The Norton got in with "one of a kind", but they are a tiny operation. Ducati always got away with tiny volumes compared to the big Japanese manufacturers.
It would be interesting to see it compete, see how a GP bike handles the battering the Mountain Course would give it over six laps.
What about the NW 200? It would need an entry there to give it a fast enough shakedown prior to the TT, so their rulebook would need to be looked at too. No Norton there.