Bah, my bad. You are not missing anything at all. I must be missing a piece of my brain as I had read "no" before interleague. Wishful thinking maybe? Probably just carrying the "un" over. Anyhoo...
LGO is right, that is an example of a layout that does not exactly make itself. I'll give it some thought. If something pops out as reasonable I'll let you know and get going toward it. May take some time before I churn it out. I'm trying to wind down a couple of other little things right now and, though I figure something can be made from your request, with that many teams it takes a while to piece something together.
EDIT: If you want to chime in with any particular details of interest, particular when it comes to the interleague play, that could help me focus on a specific direction to try to go toward a solution. Things like how roughly how many games and against whom, like say just a total of 4 series or perhaps home & away series against the whole of the corresponding division in the other league. I may not be able to do anything exactly (or may already be out in another direction
) but such specifics can help narrow down or at least order things to try.