That is the place between rock and hard place, and I know it well. I feel very comfortable in the underwire, unlined brassiere I wear most often which is a 42C... as my username suggests. Wearing a brassiere enhances my breasts and I find it quite exciting. But the world of friends and family which is important to me isn't prepared to dance with me when it comes to this aspect of my psyche and my body. That is why this place is a bit of an oasis. I know many of the men here have moved beyond acceptance. That is the reason I started a thread in this forum on the topic.
https://www.gynecomastia.org/forum/index.php?topic=36551.0Much of the conversation here focuses on the NEED to wear a brassiere, either because of nipple sensitivity or back pain. Those conversations are easy to have. The ones that are more challenging have to do with less practical and more aesthetic things... appreciation of the brassiere itself and the possibility of self-expression inherent in both bra choice and presentation. "You look great in that brassiere" is not about need, though such comments will often turn to the topic of comfort. Of course we want to be comfortable in everything we wear... but enjoying a bit of bounce and appreciating the appearance of our breasts in a mirror or window is a bit trickier to embrace. It seems much of your challenge has to do with your enjoyment since that might be difficult for your wife to accept. Focusing on "need" may get you through this minefield.
I don't think of my self as a crossdresser, but I'm aware from having visited a couple of websites devoted to that topic that a great many men are in relationship with women who are aware of what their husbands are doing but don't want to ever hear about it. They call it "Don't Ask, Don't Tell..." which is actually what you seem to be doing at the moment. There are a few people in my life whom I've told about my brassiere wearing but certainly not everyone in my life. And even those whom I've told don't get play-by-play accounts of my most recent purchases nor do I give them fashion shows. It is simply something I do for myself... but since I live alone, that is all much easier than it would be for a married man with a child at home.
Again... this is a great place to have these conversations because men here understand this territory from first hand experience... and are working to accept ourselves as we are... with breasts and occasionally with brassieres...