Hi I am playing whm and i had the same issue but found a few nice ways around it.

Have you set up your cross bars so you can press L2 and R2 together to get an extra 8 slots? You can set it up so you get an extra 16 but I opted against that as it can get a little confusing as it opens a different 8 depending which you press first L2 or R2 so I set it so no matter which I press first it opens up the same 8 hotkeys.

Also you can lock it so when your waepon is out you can only cycle through say 2 cross bars so you dont have to cycle through all 8 after you trigger something on cross bar 2