If your vision for the deradicalization of right-wing men begins and ends with "other men telling them that that's gross and to stop it" then I'm sorry, you do not understand how masculinity works.
"Men who hold patriarchal status" and "men who are feminists" are two groups who overlap less than you want them to. I'm sorry. That's not solely because men are so happy with patriarchal status that they don't want to risk it by policing misogyny/queerphobia/racism, It's because being misogynistic, queerphobic, and racist, end expressing other forms of toxic masculinity(and often abusively so) are part of how people establish and maintain patriarchal status. The men who have the ability to stop this via nothing but peer pressure are the very people who are doing it. That's by design. And engaging in feminist intervention is, in and of itself, usually the abrupt end of that status and its associated power to persuade misogynistic men.
Like, I have worked in blue collar jobs as a notably queer person. It was pretty much a constant deluge of verbal abuse. In my experience, most blue collar work environments are exploitative, abusive, and bigoted, and very gleefully so. On the occasions I have spoken up about someone saying something that was super fucking out of line (asking me which of the girls walking by was hottest. We were installing a portable classroom at a middle school), believe it or not, they completely failed to be shamed! Because nobody else on the crew gave a fuck. *I* was the weird one. They ghosted me. A full blown company ghosted me. I suddenly didn't have a job anymore because they just straightforwardly stopped telling me where the next job site was.
Like, this doesn't mean that it's your job to do it, but this vision you have of these big groups of men where everyone is on the fence and there is precisely one shit stirrer who can be shut down by a brave feminist man who can single handedly set the example for all these other guys...you are high. You are describing an "everybody clapped" level absurd scenario. Most of these truly virulent misogynistic guys either have zero friends, because, you know, our society is atomized to fuck, or they are in a group where the feminist guy is actually the weirdo who can be shut down and ostracized much, much easier than the misogynists, because there is no such thing as a man misogynists respect who stands up for women.
You might be saying "well, we're talking about longstanding personal relationships, actually. Like, they need to have to want to spend time with you and then, as a side effect, you can mind control them out of being a threat to us."
1: Many feminist men also have no friends, see the atomized society above.
2: Feminist men already stopped hanging out with men who make rape jokes because why the fuck would we want to spend time with them.
3: That isn't just because we respect women so hard. We are in many cases talking about men who are also deeply queerphobic, heirarchical, violent and abusive to other men. What initially drew me to feminism and women was a lack of heirarchical squabbling and constant bullying, and the ability to be openly queer. A lot of men who came to feminism did so because they knew that the patriarchy was not a place they would find success or acceptance. These are not the men who are gonna be able to change right wing minds.
4. Men do not view themselves as a monolith. There is no universal brotherhood of men. The actual meaning of the term "Fragile masculinity" is that men are constantly expected to prove that they are deserving of the status of being a member of their own gender. There are large swathes of men--including most of the men who you'd look to as examples of good, feminist men who you want to undertake this project--who are considered failed men, sissies, f****ts, soyboys, ect. They are. Not. Going. To. Convince. These. Men. Of. Jack. Shit. Much less successfully *shame* them. Jesus.
I know all of this sucks. I know it would be cool to be able to just point at a group and have them be responsible for the work. But nah. It's gonna have to be a societal project, one that will probably outlast all of us. Sorry. The thing you want these men to do is, absolutely, the morally correct thing to do. But presuming that it would be effective is, and once again I am so sorry about this, just ignorance of how these social groups function.