Guests of Honor?

Don't give them a consolation prize. Just let them be guests. They know they're your friends.

I totally understand where you are coming from because I had to deal with that myself thinking that my other friends and or cousins will feel some type of way. Remember it's your day and whatever you feel is appropriate so be it. I would maybe have them participate in lending a hand for your bridal shower or important errands or task. Don't dig too deep into it. Titles are not necessary.

If you have the time and budget to pay for their hair and makeup on the wedding day that could be really fun, but don't add unnecessary logistical hurdles for yourself!!

I assume these closest friends of yours will be invited to any pre-wedding events like a shower or bach party, and they don't need a "role".