When I did my FAA IR, I asked the examiner to examine me on the NDB as that was what was going to be the norm back here in the UK. Having explained the situation to him he was happy to go that way and I was happy to demonstrate competence with the NDB.
Approaches were VOR/DME, ILS, NDB and a localiser with partial panel which I made easier by getting "no giro" from ATC. Not what the examiner had in mind but solved the problem and he was pleased with that.
The most challenging part is the oral exam and whlist the written is relatively easy, the oral will test whether it was just repetatively going through the questions that got the eam pass or actually knowing the stuff. Doing the oral 6 months after the exam meant I could not ease off on the learning.