Alright, we're down 3 PCs. I don't like NPCing PCs, and this is an extreme situation: it's just too much work for me to play 90% of the combat participants.
I propose we send Kalli, Kaleva, and Petra back to the tavern on some pretext. Karl is still waiting to be written out of Warden. Let's pretend like I wrote an elegant ending, and Karl is on his way back to the tavern when he is overtaken by the running trio, who send him to the cab as a replacement pie bearer. I further propose that we hand-wave the hand-off of escort duty, as I don't have a good reason for why they would trust a random stranger, nor why the random stranger would be willing to escort a random pie. Arthur and Karl can continue solo through the last encounter and (gods willing) the pie presentation.
Then we'll regroup in general discussion. If LEW is to continue, we'll need more people than just the folks left in this thread.