It seems you ruled it out, but why not stay based out of familiar grounds in CO, and find a little hide away, modern amenity cabin in WY. Maybe, a fiveish hour drive completely changes the surroundings, or small carrier flights. Even a shortish move to Ft. Collins cuts out that Denver area traffic snarl, but makes it easy to visit. Trout flyfishing can probably be found anywhere, but it doesn't hurt to have high peak snow melt, feeding crystal clear streams. Get better sooner rather than later!