There is a truck route for KS 99 in Wamego. I wish I could have explored it yesterday, but it was already extremely late. And it doesn't show on GMSV, even though some of those photos are from 2022.
From the north, it follows US 24 E and then Balderson Blvd south. However, I don't know if it follows 4th St or Valley St (more likely) back to KS 99.
There were signs at 24/Balderson for both North and South 99Trk, and an End 99 Trk when heading westbound on US 24.