I’m not sure what a half clamp is, but the THETA V has a TW-1 case that you can attach a bolt to that is 1/4" by 20 threads per inch. This is the standard tripod bolt.
If you’re not familiar with the tripod mount hardware, here is additional information.
There’s some sample shots from inside the case with this scuba plug-in
Note that the case is visible in the shots. If you need a complete view, I suggest you buy the camera and case from a place with a return policy and test it together. The seam of the case is visible.
For THETA S
Not waterproof, but cheap.
