Replying to Filling and drilling binding holes

i got some beater j-skis and ended up breaking the px 12s i had mounted. im only planning on using these skis for another month or two at most. The front holes of my extra bindings fit in the existing px 12 holes but the back dont so i was gonna fill those with some sort of epoxy (any suggestions welcome) and the front holes in the heel piece don't fit so i was gonna fill those and re-drill those front two screws. I know that i should just get them remounted but i don't have $40 especially just to drill 8 tiny little holes. any suggestions welcome.