I didn't expect a response from you as you are not a "crap guitarist."
I suppose A minor could work, though not for my current "experiment" as I already have the parts down and I don't want to scrap it just yet.
That said, my guitar is currently tuned to C G C G C E and I'm playing a lot of two string open chord stuff so, technically, all I have to do it introduce a strong A into the mix to con the listener into thinking that is the key. I ain't got any bass down yet so I could probably take a leaf out of Bapu's book and play a single note Am chord on my cheapo bass guitar.
I'll let you know how that goes.
Any advice on technique, though? Either playing or once you have a part recorded?