Low profile? The only ones I can think of on Commodore mice are moulded onto the cable, in which case you'd never be able to wire/rewire them. I've never had a problem using standard off-the-shelf DB9 connectors and matching hoods. The STP cable is a good idea, but as pointed out, don't get the solid core type as this will break with continued flexing. If they're only 2-button mice you only need 8 cores - the ninth is used for the middle button on some mice.
Alternatively there is overall screened cable available for making cheap SCART cables, but even without the individual screens of higher quality SCART cable, it's still thick at 6mm in diameter...
Maplin Clicky
