I'm sure it's possible to swap between hotbars, so I guess it would be possible to create a macro to swap from hotbar 1 to 2 or vice versa with the same button as swapping weapon set?
it is possible, but it would only be perfect if you had keybinds for primary and secondary weaponsets, lets say your in pvp, so your a bit stressed. You accidentally press the button which does [SHIFT+R, SHIFT+1], that would make you have ranged buttons(action bar 1) but since you accidentally pressed twice you would have melee weapons..
so, give keybinds for certain weaponsets, this could then be worked into a macro which switches to the correct weapons AND the correct bar, every time - no matter how many times you press it.
saw the funcom post about adding context sensitive bars, thats pretty nice too