I think regarding the crewing it was mentioned above and someone said that for the LPL based one it is the Air Finland crew members but then there's one or two easyJet crew members to assist and show to the Air Finland crew members what the easyJet procedures are.
On a different note albeit kind of linked I have just noticed that Astraeus from the 15th June have leased an Air Finland 757 (OH-AFK) and thought that this maybe another 757 bound for easyJet but to have Astraeus crews insted of Air Finland?