I see no reason why not, although, again, you'll have to ask Arch, since he's the GM.
Oh, BTW, Arch, how will servant choice be handled? In particular, the Berserker and Assassin classes are ones which are usually intentionally chosen by the master. Will we get to decide if we want to attempt to get those classes (presumably anyone who does will be given priority for them), or will they be allocated randomly?