Hey Simon.
I like your thoughts here, and you propose a very interesting discussion.
I think in a perfect world, sure, you would tell your wife everything and you guys could be a team in this battle. But, this world isn't perfect and I understand that everyone's situation is different.
For me, my gut reaction would be to tell her, but that's because I was honest with my girl and my porn watching right from the beginning, and I never hid it from her. For years she knew everything and thought it was pretty funny and never thought it was cheating. There was only a small moment in our relationship where I hid my porn use from her (camgirls) and that definitely was a wild ride when I came clean to her almost a year ago. This obviously broke her heart, not because she thought it was cheating, but because I had kept it from her, and doing this made her rightfully feel like she couldn't trust me. We were a team fighting this shit together, and then all of a sudden, one team mate wasn't telling all the truth. Bad on me.
However, I say all of that to say, everyone's story is different and one man's perspective won't always work for someone else. I think you're right, the truth sometimes doesn't always work how we want it to work and maybe what's really the best thing is to just work on ourselves and be the best person we can be for our partner/spouse. Then maybe one day, after you've cleaned up this mess and gotten yourself to a place you want to be, maybe then you could tell her.
Best man.
You're a good man for being here, never forget that.