Yeah, that's where I thought you were going - and of course the DE is just going to switch the RNAV unit off so you have to fly the ugly needle on the ADF or he's going to let you hang yourself on a service volume issue (busted).
Cruel guy - partial panel NDB for a checkride? I can see giving you a partial panel on a VOR, but thats just cruel to lose your DG on an NDB approach (FOR THE CHECKRIDE). He'll probably be the type that tells you not to look up at the mag compass (cheating a glance outside). I can hear it now, "keep your head down son and fly the approach, ask for the heading and I'll give you the value".
My instructor who was definitely out of the dark ages did that time after time - by the time I took the checkride, I felt like I could fly an NDB approach blindfolded and with one hand tied behind my back.
Good luck on your ride, you sound ready.