Basically No ....but I wonder if using a set of Tobinaters you could rig up a mounting kit to make it fit. Bear in mind that the ADV has the twin headlamp (1 big 1 small) and the screen is shaped accordingly. It'd look a bit odd IMHO.
Thanks for confirming my theory Phil - and confirming it does indeed look a bit odd ....but that's fine - Gs's are odd anyway so the more odd you can make it the better
Yep, Phil is correct. If you get an Adventure Tobinator kit, plus the R1100GS Tobinator spacers for the front mounts, then the Adventure screen can be fitted to an R1100GS.