sync multiple 120fps source videos in a 60fps final project

Long time listener, first time caller. Please don't flog me if there is somewhere I haven't seen. I'm looking for any help you may be able to provide.

I have source video from three cameras from my son's little league games. Each camera is recording 1080 @ 120fps (GoPro, but with non-fisheye lenses). The kid's bat speed is fast enough that I can't sync the three feeds at 60fps, but if I change the timeline to 50% speed (120fps) then I see all the frames for each camera and can sync the video.

If I edit the project at 50% speed, then the output is 50% speed at 60fps. If I change back to 100% speed after syncing the video, then everything is out of sync again.

Does anyone have a suggestion for how I can sync the three cameras when the timeline only shows 60fps? I'm find with the final project being 60fps (or even slower) but having the cameras out of sync causes issues since I'm displaying the batter's box cameras as picture-in-picture with the game field (backstop) camera.

Thank you all for your assistance.

As I sit here thinking about this, I'm wondering if I need to use a tool to convert the source video to 60fps @ 50% speed (slow-mo) and then import that video. Once I import the video, then I'll be able to align it at 60fps and then change the "realtime editor" to 2x speed.

Or does this all fall apart since the "realtime editor" at 2x speed will only show me 30fps? I'm going to go try it...