I finally sprung for some bags!
Giant Loop Coyote (rear)/Fandango (tank) setup.
I used the passenger peg brackets, some AL angle iron, and a couple of 3/16" stainless quick links to make some mounting points for the lower straps.
On the rear bag, the rear straps anchor quite nicely to the rear grab bars. it's a much more solid mounting point than the fender.