The thing would make the Typhoon class look pretty small...
Am I crazy?
No, and No, it's been proposed before. I think I may have first read such a proposal in a science fiction novel, which is not to put the idea down, communications satellites in geosynchronous orbit s(Clarke orbits after the SciFi writer) were first mentioned in science fiction. I also think I read a proposal somewhat later, maybe 20 years ago, in the U.S. Naval Institute's Proceedings.
Of course it's not just been mentioned, it's been done, albeit on a small scale. Regulus was an early (and large) cruise missle lauched from a surfaced sub. Of course having to surface to lauch is a big disadvantage. Early soviet ballistic missle subs had to surface, or at least get the sail out of the water, to lauch their *liquid fueled*, missles.