When i refused the mezinka before my youngest sons wedding my son in learning found a sefer where the minhag is written so we went along with it. I will try to get the name of the sefer.No it was not in sefer Taam Haminhagim.
By us the women did the mezinke on the womens side with me and close family and then the men got the brooms and did the dance with my husband on the mens side.The musicians played the correct tune for the men but on our side it was the music they were playing at the time as they were on the men’s side.
There was no mixing chas v’shalom and the mechitza was a full wall. There were also alot of Choshiva people as guests.
Unfortunately, some people take a minhag and add flavor to it and ignore halachos.No Chassidishe minhag includes mixing. In fact in many Chassidishe circles,the kalla’s face is covered with a veil when she dances Mitzva Tanz.