You know, if the Frelick IF experiment is real (despite Jack's take), then he could be counted as both an IF and OF and that would possibly give them the flexibility to carry three catchers.
C Contreras, Sánchez, Haase
IF Hoskins, Bauers, Monasterio, Adames, Ortiz, (Frelick)
OF: Frelick, Wiemer, Yelich, Mitchell, Chourio
Turang and Dunn start in AAA. Then one comes up when they try to sneak Haase through waivers to Nashville. Or maybe Sánchez starts on the DL and Turang sticks in Milwaukee.