Take a look at the plate for the VOR procedure (13-1) After exiting the hold at 3100' the next altitude constraint is at LOMAR (same position as LAMBI) at 1600'.
Neither of the plates show the base turn intersecting the line for an altitude restriction at INAT / TUM10.
So, I would say that it would be safe to begin the descent to 1700' as soon as you leave the hold.
The altitude restriction for the teardrop is the same as the altitude restriction for the stepdown fix for the "NoPT" initial approach segment.
Descending below 2,200 before intercepting the localizer inside TBG 8/I-NAT 11 is absolutely wrong.
When do you leave a procedure turn completion altitude in the U.S.?
http://aeronav.faa.gov/d-tpp/1004/00504ILZ19.PDF