I'm not sure what your standards are, but I'm not sure if this is even possible.
I drink Stumptown which I grind at home for my espresso machine -- their caffeinated Hair Bender blend in the morning, and then in the afternoon I'll often have their decaf Trapper Creek (Swiss water process) on the days I don't need an extra jolt.
It tastes perfectly great to me. Maybe my palette isn't refined enough.
But decaffeination is always going to alter/remove flavor somewhat. So if you've tried high-quality versions like Stumptown and find them lacking, I'm not sure it's even chemically possible.
(Also I'm not super clear -- have you found high-quality decaf and you just wish it were more common? What brand(s) are high-quality? Or you haven't found it, and you're complaining that they're all "just ok"?)