An alternate...Not sure if this is much help but I covered your route entirely without riding along any ACA routes and it was excellent. From SLC on the Emigrant Trail my route went up into Wyoming and picked up the Platte Rivver to cross Nebraska, met the Missouri River at St Joseph and then down to KC. Nice riding conditions, no major climbs once past the Wasatch Range but most riding in WY above is 7000' msl...crossing Continental Divide would have been unnoticeable if not for the sign marking it.
Each riding day at 90-120 miles with motel overnights in Evanston, Farson, Lander, Alcova and Douglas, WY... Scottsbluff, North Platte, Kearny, Nelson, NE...and Marysville, KS.
My goal was to follow, from Sacramento, CA-St Joseph, MO, the historic 1860s Pony Express horseback mail route hence its roundabout nature. The route also follows several emigrant trails, Oregon Trail, Morman Trail, etc., which typically followed the easiest path across the vast American West. Not direct but without major obstacles.
Some of the towns in WY are quite far apart but this route offers solid and safe riding conditions if you enjoy solitude and long days in the saddle.