i too vote for the one arm handshake bro hug! you know, hey man! wide arm movement outward meeting in the middle about chest height, both men pull inward with clasped hands between them, pat on the back. it's incredibly intimate without being mushy. also, this reminds me of a story. *sits in his rocking chair*
at a (male) friend's birthday party a couple years ago, before i was sure about wanting to transition and definitely not out to anyone, i got up to leave and the friend got up to say goodbye. some other people were leaving too and he was saying bye to people and held his hand up. as usual for me i just poked it and he gave me that look like "come on". so i grabbed his hand. it seemed super slow and i remember everything about it. we grabbed hands, shook them a bit like a weak arm wrestle, pulled inwards, clapped each other on the back, pulled back, and snapped fingers. it took me about a year to realize that he pretty much led me through a bro hug. he gave me, as in gave like a gift, a bro hug. only now am i really realizing the depth of that little act lol. of course this is the same friend that told me to draw him when we had to do a self portrait and call it "a metaphorical self portrait"