I understand your frustration because I have also been with partners that did not share some of my most passionate sexual interests. It sucks, but it's important to remember that you have to respect your partner's boundaries.
Anal may be something she would be willing to work up to, but it shouldn't be something she feels pressured to do. I felt pressured and as a result seriously injured myself. I'm still paying the price, though slowly recovering, but hasty anal play can be very dangerous and very traumatic. My resentment toward my boyfriend because he urged me to jump in too quickly has also put a strain on our relationship, which is yet another reason to take care with anal penetration.
If this is a person you love, which obviously she is because she's your wife, you should definitely respect her wishes. If she's open to experimenting, you may want to suggest trying a very small butt plug like
this to start. The Tantus Little Flirt is super hygenic (made out of 100% silicone) and it's not much bigger than a finger. It's a good way to get someone comfortable with anal stimulation, and you could both use it. If you showed her you were also willing to experiment with anal by yourself she might feel more comfortable, too. Another good toy to start with might be a graduated toy like
this.
Whatever you do, please make sure that you are cautious with anal and don't jump into anything too quickly! Working up to things can be a little tedious but it beats the hell out of the painful alternative.