Yuneec already did a gimbal for Gopro, with integrated downlink. That gimbal only has three contact, instead of the TH six.
I guess they could easily come out with a similar gimbal that could allow mount any similar camera to the TH.
Sequoia has the same size of a Gopro, except it has a sensor board also. The problem is that it does not have video out.
Mapir multispectral cameras does have video out instead (and cost a lot less with seems same results).