Optimization options for a large number of selection field items?

I’ve read that. Just saw your note on Pass organization to external data source - #3 by Shaun_Dark_Lord saying that this is probably not possible. That’s annoying, as it means for each external data source object I need (around 30), I need 19 copies to hard code the organization filter (so that schools can’t see each other’s data) and that many core workflows to make the right objects visible… This won’t be fun to maintain…