I was wondering if I should also remove the nut directly across from the broken one... So that it will be balanced? Or should I keep 5?
Well... I broke another lug off. With just a few ft lbs of torque. Just tightening the nut. Now I can't trust any of those studs!no need, it won't be unbalanced, just drive it until you have time to repair it in a few days, weeks, months.
and if you want peace of mind, change the other 5 when doing it.