The SGB CPU is compatible with the DMG. By swapping the CPU, your Gameboy will skip the falling Nintendo animation. This decreases the boot speed.
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Thanks! I've built a MGBC, a DMGC, a Funny playing GBA so I have some experience (though very much still an amateur).
Did you use a heat gun to get it off?
Hot air station. Put down some tacky flux and kept it moving around the chips at about 380c.
Good job! You've done the research!