We get asked this question alot. You don’t need to ask someone you don’t like to be in your wedding party just to make up number. If you are worried about the processional or recessional order two ushers can escort one bridesmaid or one usher can escort two bridesmaids or the bridesmaids can walk alone.
In this wedding one usher escorted two bridesmaids. Its done alot so don’t worry about how it will look.