I have a set of 2003 Passat wheels on my syncro.  I had a machine shop
bore the centers.
I looked very carefully at the amount of metal removed and what was
left.  The structural difference is negligible and I have been very
happy for 45k and lots of off pavement (though not serious offroading)
driving.
I would suggest looking  at the wheel itself, and you will likely see
that the amount of metal gone and metal remaining will result in
99.99% of the original wheel, including all the key structural strength.
Passats are not light vehicles, and the wheels I have hold the bead of
the 235 75 r15 BFGs perfectly.
 From a satisfied vanagon-passat wheel owner,
-macjack