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Myself if you weren't having problems with the button and the head is not leaking from the o-rings just do the booster pump. If I remember right there's only been one person on the board that had trouble with the lower unit. The fulcrum arm came off one of the pins. Myself I don't like cracking...
Seems like the majority or 99% of the time we either have head button problems. Then also there is the o-rings and possible cracked head. Then you said there's a problem with a booster pump putting fuel into the crankcase. I'm guessing your FDC has been bypassed so that rules out putting fuel...