Given how they treat swing drivers at my station, I would never ever ever ever ever ever ever ever ever ever ever ever ever ever ever ever ever ever ever in a million years apply to be a swing at my location. Split shifts, 14 hour days, 5 hour days, you name it. No consistent paychecks for the swings here, just more frustration. And the weeks you do make a ton of hours, you'll be miserable and exhausted.
Since you're considering a swing position in your station, ask the swings there how they feel about the training, hours, treatment. Every station is different, so you may very well have one of those shangri-la stations where everybody is happy.
For me, I'll stick with my regular route and consistent hours. If I was part time and looking for more hours, I'd either pick up another job or volunteer for more hours at the station doing the occasional PM route or working the night sort when you want to.