You don't want to rush the 2k according to the PPJ . I would do as BK says, strip it down, then shoot Epoxy.
I understand your situation and time constraints so take off a few panels get them in that Beautiful Black Epoxy each week end until it is all in black, then go after the body work a panel or two at a time .
Once you get the epoxy on it you have years to finish the panels , and can be driving it in the meantime if need be.
If bare metal has bondo on it, then epoxy, the epoxy would have to be breached for moisture to get to the bondo. At that point the bondo transfers the moisture to the bare metal lying underneath it and rust forms.. A coating of epoxy under the bondo would have stopped panel rust- out in this scenario.