Unit, I was in much the same position as you. As I've posted on here in the past, my main ex girlfriend, Jenny, whom I was with through most of my college years, wasnt ticklish at all. I tried many ways to tickle her, and got really no reaction. Luckily, I was just into feet, and not tickling, at that time. There were only two occasions on which I saw her even remotely have any reaction to tickling. Similar to your wife, Jenny was once tickled by her brother on her bare feet when she wasnt looking, and kind of giggled, and moved her foot away. Another time, we were swimming in the pool, and her cousin had her backed up to the wall of the pool, and got her ribs, causing her to double over, and giggle. Beyond that, I tried tickling her for nearly 3 years, barefoot, and in every state of dress, including, ahem, nude, and not a reaction. Similarly, I saw other friends and relatives try to get her on all parts of her body. (Non sexual and clothed except for maybe in a bathingsuit, and no reaction) It is frustrating, but this is how it was with her.
So, I know all about being with a non ticklish woman. I was with one for almost 3 years. Now, while being with at least a semi ticklish woman would be my hope, if the girl had all the other qualities, I might be able to bear it. Iam sorry to hear that your wife isnt ticklish, but if she has all the other qualities, I guess one can easily understand choosing that over tickling.
Mitch