can play by slapping his cock on the keyboard

I guess it's theoretically possible. The distance from space bar to QWER isn't that long. He could use his balls as an axis and control his lower blood circulation to extend and retract his button presses. the rest he can compensate with mouse clicks.

also, it's weaver so almost no active items. Only one you'll be pressing a lot is Shukuchi and the occasional time lapse. And since it's 2k, they'll probably ignore geminate swarm or cast it randomly anyway.