There is no rational explanation
Appreciate the input, all.
I can claim no rational basis for wanting to do this. I've been a bare-wire guy for years, but I'm not sure the 12 awg wire will even fit in the existing terminal openings -- but I haven't tried it yet so I could very well be wrong. I know there will be no change in sound quality, and that nobody will know (or care) that bananas are back there besides me... but it's one of those irrational things about which one makes up one's mind, and from which one does not want to waver in the face of pesky details. I have scads of tools. I have the know-how. I have a Parts-Express catalog. I can make this happen, man!
As for the inherent coolness of banana plugs... again, it's just one of those things. It's cool just because it is. Like when I get around to buying and restoring that '65 Eldorado convertible, I'm gonna paint it metallic green. It's cool just because...
Peace,
Greg