B-Cam for XH2s?

I've been using the X-H2s for docu work which has involved a lot of travel and keeping shoots fairly low-profile. I need to find a better solution for my b-cam - for a second angle when shooting interviews, having a backup in case something goes wrong with my a-cam, etc.

I could always get a second X-H2s but I'd love to know if there's anything smaller/lighter that would work well for this, too - anything to save room and weight in my pack. The main requirement is just matching the look of the a-cam pretty easily, but I don't know enough about the variety of Fuji cameras and sensors to know which would fit the bill. I usually shoot F-Log 2c on the X-H2s. Shooting with the same batteries would be a bonus but not a dealbreaker.

Appreciate any advice y'all have!