Some people might hate me for this but i don’t care.
I agreed that AkihikoxHiroki and/or AkihikoxTakahiro could work. They could be dating for years and make such nice, close, and healthy couple. But that’s could only work before Akihiko meet Misaki.
I might be biased, but in canon, Akihiko and Misaki who started with bad and worst first and second impression toward each other, end up attracted and falling in love with each other. When that time Akihiko still in love with Takahiro, and Misaki without himself realised (until much later) already attracted to Akihiko.
While the first time Akihiko met Hiroki and Takahiro, they started with simple, nice, and even good impression.
Of course in fanfiction/fandom as writer and fans you all could imagine and make it that would never happen. But if we really talk how the canon works, and some people think should have works, put aside Romantica are meant to be as Fated Lovers/True Love (Akihiko says his relationship with Misaki is destiny and who meet whom first does not matter. Misaki agreed in his mind. And JR ED3 everyone), based on their profession and relationship with other characters; yes, Akihiko and Misaki would meet. And they would bond with only-god-know-what.
Because, even in canon, as a couple with lot of different interest, age gap, social status, brains, THEY WORKS. They understand each other and accept each other with the way they are. They don’t deny each other’s flaws and accept it as whole.
So yeah, AkiHiro and AkiTaka could have work before. But they would fail without a doubt. Except if Misaki died or never exist before they meet and bond.