Just for the record, I got a letter from the FAA today saying that they had reviewed my qualifications and declaring me eligible to take the written. The letter said that I appeared qualified to check everything including ATP, not just private.
The written will be easy, after a little studying, and I have the FSDO's encouragement. My big issue is that I am just on the edge of 300 hrs/yr as PIC, which is required to keep the designation. It's always sumpthin'. (Checkrides given DO NOT count as PIC time, by the way, at least according to the SLC FSDO. I fly about 350 hrs/year, but about 50 of that is as a 135 check airman.)
With a little luck, I will be getting many phone calls at dinner from nervous candidates!