First, I apologize for the belated trial myself. I haven't had a need to make schedules for a while.
Alas, I have tried this out now in v11. It mostly works and with a few minor edits I made a schedule for a league with successful import into OOTP 11. I'll post a few things as feedback or if others would like to use this for themselves. Hopefully davep will check back in.
a) I had to remove the 'Stickware.lsdl' from the SCHEDULE type definition in the second line of the schedule. It is supposed to be a comment area and it works ok in the schedule name, but seemed to mess up the schedule import.
b) I had to add an '_SL2' for sub-league 2 in the same SCHEDULE type definition. I also added the same in the lsdl filename.
c) The day of the week was wrong in the SCHEDULE line. It was listed as "1" though the Stickware software says it will be Monday. The OOTP scheduler uses a Sun-Sat week, so Monday should be "2". I changed this myself.
d) The created schedule ended up starting with the first game on day 4 instead of day 1 as most schedule have. I assume this has something to do with the start date choice and where the first Monday is in relation to that. I got around this by changing my start day of the week to Friday so day 4 ended up being Monday. Minor quibble, but could cause some confusion.
Hopefully others will find this useful. Thanks davep for at least making my schedule creation easier...
It would be ideal if something like this could be incorporated into v12.
EDIT: I would assume this would work in any of the 2006 and newer versions. I don't think anything has changed in schedule making in that time.