If anybody's interested in this "two bands, one coax, no switches"
solution, I'll try to put a PDF together over the weekend (it isn't a
good subject for ASCII art). It also struck me that this may be a good
subject for an Excel spreadsheet, or one of Reg's programs.

Ian, count me in. While "all band" operation is always desirable, when
you get right down to it 160/80 or 80/40 are the gaps I'm really
trying to fill. And while many of the other solutions proposed are
innovative and tempting to perform, the "keep it simple" approach has
very strong appeal.
Tnx & 73
Dan (K0DAN)