I try to do this with Alphagear at the moment, but that consumes 2sets and bars in there.
Similar to how Assisst Rapid Riding slots rapids onto a specified slot, I'd like to have an addon that allows me to swap between Rearming Trap and Channeled acceleration per 1 hotkey. (The auto-reslotting on cooldown is not needed)
I think it wouldn't be necesssary to check which of the 2 skills is slotted at the moment, you could just press the button again. Would be interesting though if it could "find" the skillslot automatically, but setting it manually seems way easier to realize.
Reason for this is prebuffing with channeled before pulls, to then later use trap.
Maybe there are more uses, so it could also be set bars, that are cycled through (on backbar only?).
I'm also gonna ask the ARR author if I can slaughter his code and try a bit myself. But ESO might work flawless before I manage to write an addon XD