Hi Christopher, and welcome!
You can certainly use any of the mentioned hardware in ALK2 Solo but just remember that Solo only allows one MIDI controller to be connected at a time, whereas ALK2 allows for an unlimited number of controllers to be connected.
To silence the Metronome you can Power it off using automation:
Create a Command track, hold Alt and draw a Scripted Command region ("scripted" is something that's pre-programmed). As target, choose the Metronome track's Power option, then simply set it to on or off.
For a more detailed look at automation in ALK2 I suggest taking a look at the following video