Could you cycle? set the seat high enough to take almost all the load off yer knees (pedal at the bottom, heel on it, slight bend in the knee, perfect height)
Been using riding as my "leg day" since doing an actual leg workout would knobble my legs so much that riding was hard. So weights for back/chest/shoulders and ignorng arms for now.
Last night I managed to get 2nd on a strava segment locally. Was 6th for a while but noted the start and pushed hard till the end :D well chufed about that, like Ben its bragging rights :D
Good work on the 150KG press though!!!! that seems mental weight