I'm fortunate to have a few friends who are similar in that. We met in a religious group context, so that may have helped (this particular group emphasized community and sharing with each other, so attracted people like us). In addition, this group is mostly mixed company (women, men, and non-binary folks), so there were more opportunities to be emotionally open.

For those guys who are a bit more closed off, I find a good "entry point" is compliments and saying things like, "I appreciate you, glad to call you a friend." Their discomfort will be offset by the positive affirmation (which for these men is often lacking), which may make them open to it. And when you occasionally get the guy that retorts with, "what, are we gonna go dress shopping next?" or something, you can subtly imply that taking a compliment isn't un-masculine ("man up and take the compliment bro"). Just remember when people push back against that kind of thing, it's because they feel scared and vulnerable--don't let it throw you off or push you away.

Finally, if you need some inspiration, watch or read the Lord of the Rings. A bunch of masculine dudes who can kiss their homeboys on the forehead before slaughtering an army of orcs is exactly the type of masculinity the world needs.