Well the accepted base classes in Midnight are Barbarian,Rogue, fighter and three specific classes for the setting, channeller(replaces spellcasters),Defender(replaces paladin and monk) and wildlander(replaces ranger).....
Also any class that does not have spellcasting,spell-like abilities and supernatural abilities should be acceptable(Marshal,Scout,Samurai,Swashbuckler)......
Also everyone gets a heroic path which add some abilities at each level.......
Gear is very restricted(especially magic items).....
@Arch.Arc I have no problem with your idea and mechanically it could work very easily in the setting,no teleportation but long range communication it is okay....
I was thinking of begining at level 1 for the adventurers and level 3 for the Patrons.....