I don’t know, direct?
Like Imactuallycontrolling myNecromancerand her boney bodyguards, not just clicking a unit and watching their animations.
Tell you what, lets address this setting-up process first.

If you might get Battle.net working, you might get Diablo IV working.
Diablo IVs battery drain is on the high side, though alsodecent-ish for a AAA behemoth.
Frankly, this is one youll want to keep at 60Hz.
For a game with no official Steam Deck support, Diablo IV adapts to the hardware brilliantly.
Performance, in most areas, is impressively silky as well.
Myrecommended parameters for PCare ideal for the Deck too, with one addition: FSR 2 upscaling.
Diablo IV: best parameters for the Steam Deck
And thats that, really.