There is zero chance of Newcastle or any other city within England being a success, that includes Carlisle. The only thing that would work would be Newquay during the summer.
While theoretically a few flights to Edinburgh per week would work well on that size of aircraft if catering to the local leisure market, I can't see it due to the conflict with BE's LCY route. Belfast I can't see as it just doesn't have the same level of appeal.