Unfortunately I think it is a case of removing the door liners to remove the tweeter housing/covers, although I guess the door liners have to come off anyway to do the wiring!
What I did see the guys in the workshop doing was the bit where they remove the inside door handle "chrome" trims which cover two main liner screws. These chrome covers are a Royal PITA and extremely difficult to get off whilst remaining in one piece!
Sorry, but that's the only advice I can give here so far.
Can you post up a pic of the switches you got & where from Graeme?
Regards,
Les.

