Try to find a child to adopt that would have features similar to both of you, or choose a child you both could love. Once you set eyes on the child of your dreams, how they got there won't be an issue. Try to find out the medical history to avert future problems, if possible. Loads of children are out there unwanted! Your wife will be even prouder of the man she has because you will be a great father simply because you desire to be a husband and father! That's half the battle. Good luck, but remember, children can be more of a challenge than you expect!
Don't even try she should love you for you, trust me my husband is far from perfect but I just deal with the minor stuff like I tell him to zip it and flip it do I won't fall in the toilet. But it's just something I deal with but try to talk to her 1st sweetie and I hope it all works out in your favor.