There are no “weapon sets” currently. I’ve actually suggested this in the past, but again suggested it in a big thread I’ve made for experimental feedback. (Said post here) Things found in 4 hours (co-op test, played solo) - Wicked Experimental Branch - No Rest For The Wicked
It’s, as you found out, only cycling once on the main hand OR off hand, and goes to the right on the inventory page.
Because of this I will NEVER have more than 2 main hand weapons, and don’t expect I’ll ever have more than the 1 off-hand spot. (If I really need to change, like to have a torch I’ll manually swap.) That way any main hand swap is fast and easy, and I know it’ll be Main ←> secondary. (So like with my main that goes blood soaked sword ←> bow and back.) I found when I started EA that gets REAL confusing if you have more, because you aren’t just single tap swapping, sometimes you’d have to double tap to get back where you want. And since each swap takes time for the character to swap, that can literally kill you if you aren’t back to where you want immediately. Plus, on controller this means moving your movement thumb off of it’s position to press the swap. – And for off hand item, well I just haven’t seen any reason to have a 2nd, but I’m mostly melee all the time. 