It wouldn't be possible to port them, but emulating them would be possible. Super Smash Bros. Melee would never be possible because the GC is 2-3x more powerful than the DC. The 64 version might run in DaeladusDC but it would only run at 10 FPS with no sound.
Chui said in an interview that he would look into N64 emulation after he's done with his PSX emulator (which he hasn't started).
Your only choices left are to use a PC emulator like Project64, use a N64 emulator on XBOX if you have one or buy the hardware.
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