Inside out three needle bind off?

Hi,
I am doing some double knitting and I need to bind off the two layers (different colors) together. I want a clean seam, like the look of the three needle bind off, but because of the way the piece is, I cannot have the two right sides facing each other to have the line on the inside, and the clean seam on the outside. Is there any way of doing the bind off with out having to turn the layers inside out so the right sides are facing? or would it be easier to just bind them off separately and seam them together afterwards?

Cheers.

You could do the 3 nbo anyway, the BO edge looks like a chain stitch, especially if you do it in k1,p1 ribbing.