Not sure if thats what youre looking for

/crosshotbar copy min 4 min 2

Crosshotbar instead of hotbar to copy on the gamepad crosshotbar (its odly named)
copy for copy a hotbar
min (class) 4 (crossbar4) over to
min (class) 2 (crossbar4)

(this would duplicate the hotbar 4 to hotbar 2 on gamepad)

just had to look it up myself and thats what my experimentation lead to