are you thinking of a whole new ski or adding RES to the caylor or jeffrey?
I've been thinking about a ski like this a lot actually, would you be able to have RES in the tip and tail without having a wonky tight sidecut underfoot?
for me the perfect do everything ski would be basically wrenegade dimensions with a couple mm shaved off the tip, longer rocker in the tip and tail (twintip), very gradual RES tip, straight or slightly tapered tail, and the tiniest bit softer in the tip and tail.
i aboslutely love my wrenegades but sometimes i like to land backwards too.