[snepp]

You should be able to do it without having to mess with the league events.

While you can't import a schedule manually while in spring training, the "Generate Fictional Schedule" function will import a matching schedule if it finds one, and that can be run during spring. I've had to do this multiple times in the past when I've done league expansions and had forgotten to load my preferred schedule for my new structure.

If the function is loading a schedule different from the one you want, you'll have to go into the schedules folder and remove the offender(s) until your schedule is the one chosen.