That's great your knee is better - specially without surgery
No idea what to do about the pizza - seems a bit pointless but if you like 'em that much I'm sure someone will have a solution. Maybe there's a tofu product that would do the trick.
As for the butter substitute - I don't know if its available in your area - but shops here have an olive oil spread that's not bad. You may have to search for it a bit but its worth a try.