Eons ago (1997) I had my initial checkride with an FAA examiner. They actually
had to transfer him to Greensboro so he could handle my checkride.

Nowadays they apparently generally delegate initial glider CFI checkrides
to glider DPEs on a case-by-case basis. There just aren't that many FAA
examiners around that are qualified to do those rides, and they'd rather
have DPEs do checkrides now in any case.

So, the thing to do is to have your instructor contact your friendly
neighborhood FSDO and tell them that they will have a glider instructor
candidate to deal with in the near future (when you're reasonably close to
being prepped, that is). They will tell you about who can do the checkride.

Matt