Wouldnt it just be better to fix the problem? You can just plug off the offending systems if your door locks etc are leaky.

If the problem is in the ignition lock housing it isn't too bad to pull and replace the vacuum part of that either.

It looks intimidating at first, but I really didn't find it to be.

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'85 300D, 'Lance',250k, ... winter beater (100k on franken-Frybrid 3 Valve Kit)
'82 300D, 'Tex', 228k body / 170k engine ... summer car
'83 300TD Cali Wagon 210k, wife's car