I had been wanting to summit this peak, as well, but had heard about the adventure it has become. Thank you for providing such in-depth details and photos; it helps to put a potential summit trip into potential.
Also, I believe I have some beta for Little Phelps at home. I can pass it along to you, later.
Phelps was an enjoyable trip, and I would like to climb it again some day. My plan was to summit Phelps, have a good look at Little Phelps, and possibly try to scramble the latter on the same trip. Unfortunately, clouds rolled in before I got up Phelps, and the approach took longer than expected, not to mention the long drive on the N Fork road. I only have one friend who has expressed any interest in Little Phelps, which I think is surprising given its close proximity and prominence.