Today, 5-16-2020, my wife and I went out to the proposed re-route to check it out. We drove to the top of Fleck summit, unloaded the bikes and went exploring. We checked out a multiple of roads, ATV trails and single track in an attempt to find a route on the west side of this re-route. We found the "pack trail". It is not much of a trail. but it appears to be the only route that actually goes. We attempted to ride it with out much success. So we walked for about 40 minutes down the trail. We did not see any place that we thought was ridable, either up or down. The trail is just not much of a trail. No foot prints other then some elk tracks, no bike tracks. It is narrow, with places that have some serious exposure. The trail is so narrow that you cannot push your bike and walk beside it. You would have to pick up your bike and carry it. 2.5 to 3 miles of bike carrying. If you are traveling counter clock wise all of that would be uphill. I recorded about 600 ft of elevation gain, which doesn't include the part we walked. To traverse this you would have to unload your bike, carry your gear the 2.5- 3 miles on a sketchy trail, turn around go back that 2.5-3 miles and carry your bike back up.
I just think that you would be doing most people a disservice to suggest this re-route. Unfortunately there is just no easy way around this construction project. But IMHO Andrewh's re-route is not the answer.
About us.... I have been riding these mountains since the middle of the 1980's. (before there was bike suspension). My wife is an experienced biker and hiker with numerous expeditions under her belt including a 32 day backpacking trip with NOLS. We are not city folk!
I think you would be doing most people a disservice by recommending this re-route.
All the best,
Sprocket