I'm wondering if anyone knows of an efficient way to split a song into equal 1/4 note, 1/8 note, 1/X note slices as seen on track one in this project.

Currently I've just highlighted the area I want to split and used the shortcut Ctrl/Command+E.

However, I have 230 tracks I need split in this way, resulting in around 2000+ slices per track, so doing it by hand is giving me nightmares. Is there a way to script this, or maybe some clever use of follow actions? Anything to speed up the process would be greatly appreciated.
NOTE: I'm not talking about using the slice to MIDI function, I need each track split into equal parts on the timeline in arrangement view.