No, they will cut your top anyway just to do it. And to defeat the club, they just cut the steering wheel.
BMW immobilizer system is pretty good already. Not much else you can do that would help that much.
Locked or attended garage is probably your best bet.
'95 Alpine M3 LTW
'00 Dakar M Roadster
'02 Topaz M3
Red/White SRF #4 (Chassis 561)