From a UA perspective.
1. Too difficult to say what the future holds, but dropping trips is difficult. Seniority makes you get what you want. As a junior lineholder you get the leftovers, but that doesn’t last long at junior domiciles.
2. Personal leaves of absence are uncommon, but approved for good reasons. Not sure if yours meets that mark.
3. Kind of a non-answer, but depends on the fleet and seniority.