Regulations surrounding funerals are regulated both by civil and ecclesial law. You need to check with each of the Porvoo churches individually, as with your Embassy, if you wish to use the services of any of the Porvoo churches when it comes to funerals.
What does it cost?
The Porvoo Agreement is an ecumenical, not an economical agreement. This means that rules regarding fees for different ecclesial services differ from Church to Church.