Any 100 kollel yungerleit with smicha can sign a Heter Meah Rabbonim. It shouldn’t be hard to put it together, if one wants to.
Ashkenazic husband’s cannot give a Get against the wife’s will since Cherem Rabbeinu Gershom prohibits them from doing so. Any non -Ashkenazic husband can give his wife a Get against her will. Non-Ashkenazim can also be married to multiple wives.