Finnish 2nd league Mestis has expressed interest to include teams from Riga and Tallinn to join it.
My suggestion for divisions would be like this:
North division: 7 teams from Finland
South division: Tallinn, Riga and 5 teams from Finland
Regular season within the divisions, four best of each divisions to playoffs. Last ranked Finnish teams of both divisions to qualification with Finnish 3rd tier teams.
Is the Liiga a closed league now so Mestis won't be promoted?