I don't think its a bad idea, but would also echo Commutair. Piedmont would also be driveable from EWR and offers the same bonus as Envoy.

Endeavor sounds like a solid plan. Good pay, short upgrade, bases where you live, and a guaranteed interview with Delta. Do you have a degree? I have heard this is the main issue causing people to reveive a TBNT. Maybe an Endeavor guy or gal can fact check that and chime in on the success of their interview program.

I dont think RAH should be very high on the totem pole. Not because its bad, its actually the opposite from what my friends there tell me, your other options simply offer better long term benefits and comparable pay.