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The shims take the slack out in an outward direction parallel to the direction of the driveshaft. If the wrong shims were in there you'd likely have wobble in both planes. Eventually (maybe immediately) I'd imagine you'd feel vibration. And the flange would probably self destruct in a similar fashion to the way it currently does.
Thick grease would probably be better than nothing, but I don't think that would be enough. It could possibly even act as a cutting agent with the vibration and a couple thousandths of clearance.
BMW really should have used a pressed on piece, but they're not likely to revise it any time soon. I'm at 50k on my TC, 30k with the loctite. If it cured correctly, i can't see it failing. It's essentially pressed on at this point. I don't see any downside to the fix, if it fails you can always remove it with a torch if you want to rebuild. If your replacing the TC doesn't really matter
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