Yeh, I understand ya there man.
I remember when I was like 15, I actually gutted an old Atari 2600 joystick that stopped working and built my own joystick and wasn't that tough because it only has 4 directional contacts (up, down, left, right) and combos of those for the diagonals as well as the single fire button contact.
All the logic and rumble and fancy stuff in one of these PC Logitech controllers would probably do weird things to the Commodores circuitry, lol. Maybe even a "Bzzzt!" huh?
I bought a Kraft MazeMaster off eBay, and if it works as well as the one I remember having back when I was a kid, I think my son will like that a LOT better then this Wico bat controller I got with this C-64 setup.