OTOH If you let it download maybe leave 14279 in your $WINDOWS BT folder maybe that will stop the 14279 WU downloads and restart prompts .
Once you revert to the slow ring it may be nearly impossible to re join the fast ring without starting up another Windows Insider account or at least rejoining W.I. with your existing M.S. Account
I rolled back an earlier test build and WU left me alone until a later build I didn't have to change anthing .
OK, but I guess, that 1st an last doesn't really matter.
So this wasn't helping much for me. Next step is reinstall the drivers.