I would probably start Houston for three, and then Devin Jones for two, Pace for two, and Swindle for two. And pray for rain. (That doesn't have the same ring as Spahn and Sain and pray for rain). Then I would have Hollinghead, Wesson, and Reed on standby and ready to go just in case one of them (or more) struggle. And I would meet with the pitchers and tell them, Hey, Houston, all you have to do is get nine outs. Devin, just get six outs, and etc. Just try to simplify it and try to take as much pressure off of them as possible.
I'd also consider Bowen based on how he threw in the bullpen.