Non-moh terms for Bff/matchmaker

My fiancé and I aren’t having a wedding party since we will have a small wedding and didn’t want all our friends standing up front with us or even processing down an aisle (plus his parents insisted his brothers all be the collective best men and it was just getting to be too much) so we are excited to just have it be about us and our parents. HOWEVER, my best friend and roommate (and also the one who introduced me to my FH) has been helping me so much with organizing and planning and I really want to recognize her for the important person she is to both of us!

What are some ways I can recognize her as an unofficial MOH and are there any terms I can use to kind of “propose” to her? I was thinking Matchmaker/Cupid of Honor, Best Woman, or something cute like that?

I also want her to be the one to sign our marriage certificate (the FH will get to pick someone too but the guys don’t have any planning responsibilities so I don’t feel like they have to be recognized in the same way).

Any other terms/names/ideas would be so so appreciated! How are other couples without traditional wedding parties thanking those who help so much?? thanks!