Including Future Sister-in-laws

So my fiancé has two sisters, one of which got married last year. There was big drama in their family because the sister getting married did not include the other sister in her bridesmaids, but included my fiance as a groomsman. Their mom cried about this, and I said I would include both sisters as future bridesmaids in my wedding to make her feel better. Now, Im engaged and I’ve realized both sisters are very difficult and I’m not close to either and would rather they not be very involved. My fiancé says it’s important to him for both sisters to be bridesmaids, but I only have one brother and have friends that I would rather include than his sisters. He’s not open to them being groomsmen because he has other people he would rather include. My compromise idea was to include the sisters as a separate familial bridal party where they walk down the aisle with my brother and then take their seats in the front row. Do you think this would be an effective compromise? I’m too stressed about including the sisters in my bridal party and other bridal events, but I also want to avoid drama as much as possible.