Uhm guys, you can already do this in the game without any mod.

Assuming hotbar 1 is your regular and hotbar 9 is your AOE. Just create 2 macro to switch between them. I do this on RPR 'cause the absurd number of buttons it has.

/macroicon "Soul Scythe"
/hotbar change 9

^ put that macro on your Hotbar 1.

/macroicon "Soul Slice"
/hotbar change 1

^ put that macro on your Hotbar 9.

Than voila, you don't have to redo and add any keybind, so can just 1-2-3-4-5 your AOE set like usual. Work well on DNC too, but DNC doesn't have that many button to begin with.