Not normally with a VOR - no point - but could be
Yes, sir. Lots of those here in Colombia. Seems to be the opposite case over here, since I haven't seen an NDB coupled with a DME yet.
By the way, low power output NDB's can be co-located with Marker Beacons on ILS systems. Those ones are called LOM or LMM or whatever. LOM: Locator Outer Marker; LMM: Locator Medium Marker.