I would suggest a VFG, you can trim it down to where it weights almost nothing after deciding how you want to use it. There are three basic grips with the VFG... thumb over (c-clamp) thumb forward or broom handle, they all bend your wrists various ways, but all those 3ways are more comfortable than more tradititonal rifle grips and some of the three gun type grips.
I don't recomend the AFG even if it is confortable to you, as it makes it a lot harder to lock on to imporvised support positions.
Above all, practice dry at home, lots of dry fire etc, figure out what is going to work for you then spend your training ammo getting used to it.