"Evergrenn should come up with a product that includes desoldering kits and an Athlon 4 upgrade chip. "
Considering the P3 uses the GTL bus and the Athlon uses the EV6 that might be a little trickey to pull off, even for the wizards at EverGreen.
"Nothing a steady hand a soldering iron can't fix

"
Unless you have access to a surface mount soldering station, I would not even think about soldering on the Xbox. In this case, the only thing a steady hand & a soldering iron will get you is a $300 door stop.. or keychain
CH2