Having an "usher" as a "bridesmaid"

I'm having a man of honor who is best guy friend. I'm having him match my bridesmaids and he will stand next to me!

If FH is cool with him being a groomsman I would say go for it. When I think of ushers I think of the people helping guests to their seats and passing out programs etc. If he's going to be in the front he may as well be a groomsman. He can still participate in the bridal (girl stuff) b/c that's your friend.

I'm having a man honor. He will stand beside me and can wear whatever he wants to.

So I think that you're overthinking this. If he's part of your bridal party then he can stand on your side, and perhaps wear a vest or tie that matches the bridesmaids. You could call him a bridesman. An usher is someone who seats people and hands out programs so I don't think that's what you mean to call him.

My cousin had two bridesmen at her wedding last week. They wore the same thing as the GM, but they were listed as bridesmen in the program and they stood on the bride's side between two BMs. They were the bride's brother and the bride's cousin, who used to be her roommate. I really don't think it matters whether your guy friend is gay or not. One of the bridesmen mentioned above is straight and the other isn't. Both were pleased to stand up on the bride's side and both got escorted by GM during the recessional. They escorted each other into the reception and had a lot of fun with it.

Ushers help seat people and hand out programs, kind on like a consolation prize/position