DeWalt 20V portable air compressor

The 20v DeWalt compressor might be just the ticket for you, I'd buy a couple 20v batteries and a charger just to have on hand for when you need to use the compressor. I have several Dewalt 20v tools and they are well made and quite portable, check the factory outlet stores for some good buys, especially for reconditioned items; they have sales quite often. I have no idea what your total cost is going to be, but it's certainly worth looking into, and you will save a lot of space by getting rid of the pancake job.