We constantly hear how important communication is and I agree. We also hear that relationships are hard work and I also agree. That said, I think there are times when something has been talked about and worked on so much that the work itself almost becomes the issue.
I think (and it's just my opinion) that humor is an excellent idea and I'd add do mutual (non sexual, non talking, non affectionate) activities together. I'm assuming the Mrs. Has some interests/likes that fall into this category. If not, maybe finding some and doing them together is a way to start the intimacy ball rolling.

I really like your perspective that sex doesn't equal intimacy or affection and can see why you're concerned that it's not happening given her not touchy-feely temperament. I think you guys need a break and intimacy may happen but if you do things together. Not with sex as an end goal but with the goal of remembering why you guys liked each other enough to get married in the first place or as a way to show off your strengths to each other. Maybe she's super smart but doesn't get to share that part of herself with you cause she's really smart in a subject you know nothing about. If you can find a way to share it that might go along way.

I really hear a lot of care and consideration in your post. I wish you the best of luck.