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Picard
dancing james
If you can bottom out the crank on the bb i.e., the bolt flange touching the end of the bb axle, then the crank is irretrievably fucked anyway. AFAIK the shim you suggest doesn't exist. My research suggests that fears of deforming the crank taper by over-tightening are unfounded, so just put the merest suggestion of grease on the bb tapers and tighten it hard. I wouldn't use an extension bar, but plenty of oomph on a standard Allen key should do it. If you're really concerned ask your LBS to use their torque wrench on it.
EDIT: This assumes that the tapers are in reasonable shape. If you've been riding the bike with the cranks loose, then they may well be deformed already and need binning. Pictures would help.