We almost crossed paths. I rode from Heber (Daniels Summit which you called Solier Meadow) to West Yellowstone from Sept 2 thru Sept 13 GPSing the Great Western Trail.
We were on many of the same roads but I explore every option. I rode the same rocks from hell west of Hwy 150 to Evanston that you did years ago.
The monument at SW corner of of WY was set in the 1800s and is just a couple miles from a Pony Express station that you also rode by.