nice list Rich...have bike shuttled Boulder,Gore Crk.,So.Platte [dirty and Foxton/Waterton/Deckers],and all the town runs [Bear ,Cherry, Clear]..Waterton doesn't make much sense ,since you cant drive to the takeout,but you could run Foxton or Deckers thru Waterton ,carry back to Waterton. put in then bike to your car..biking that sucks with much traffic,but both the Colorado Trail and Buffalo Crk.are nearby w/biking and camping...a lot of times i will run Foxton and then walk or bike down to the rapids in Waterton to have a beer and smoke.have shouldered boats up Waterton many times ..not so fun with a bad knee ..
Is the bike path from Golden to Black Rock put in done and opened?Does it go all the way up to Kermit's ?
of the runs you listed Anthracite from Erickson Campground down and the Lake Fk. seem best for the OP's needs ....always thought it would be cool to bike shuttle Shoshone or on to Glenwood.If III was your cut off point for solo boating then the upper Taylor above the res has campgrounds and there is a run that at 1000 is basically one continuous III- rapid for 3 to 5 miles..Dinner Station [?] campground...