Thanks guys for the input!
I’m going to go with the 1/4 Milwaukee 18V. The M12 1/4 version just wasn’t powerful enough.
Getting the nuts started and final tightening will be done by hand, but the inbetween will be done at a slow speed. Looking forward to breaking the 24 lugnuts loose on the 4 karts between sessions to being a cakewalk now.