Solution-I sent my Simms boots to Dave Page, Cobbler in North Seattle. For $60. plus postage he took the felt off and put Simms Vibram soles on my boots. He did a terrific job in a timely fashion. I'm proud to report that in 6 days of using them I remained upright. Of course if you want new boots--I won't tell.
"You must not be too greedy in catching your said game (fish), as in taking too much at one time...That could easily be the occasion of destroying your own sport and other men's also." Juliana Berners (1450)