MSLS reference user and blog collection

Hi,

We have some different websites with languages en, de, fr, it and we have too many flags to choose from. I’ve added different reference users in the different websites but the flags stay. Do I have to log in with this reference users to avoid the not suitable languages?

I saw also that you have a filter msls_blog_collection_construct on https://msls.co/hooks-filters-and-actions/ but I would like to include only certain blogs in a collection and not exclude every single misfitting blog…
Do you have an idea how this code can be changed to include 4 blogs in one collection?

Thanks in advance,
Chris