Just for clarification, the eSM rules (written by the Finnish Esports Federation - SEUL) in 2019 said that an organization would have to be based in Finland in order to be represented. I haven't seen the 2020 rules, so I can't comment on that, but wouldn't find it surprising if it was written in the same fashion.
FCL was under the eSM license in 2019 and I believe that will be the case in 2020. However, the licensing hasn't been announced for the eSM 2020-2021 applications yet.
No current announcements about any upcoming IS Cup, but unless it is operated under the eSM license, it is up to IS to decide what kind of tournament setting they want. IS Cup 4 was open to all of EU.