A fellow RHM-12 owner here. I love it (though need to use it more often). The photo obscures the connection point a little so I wasn’t sure how you had it set up. This is the one I use:
I did switch out to my old Hama last Spring which works well. Now though I just want to pop it on a picnic bench, chuck on 3 radials with the Diamond tripod adapter and then operate QRP.
My set up (Manfrotto and later in the thread the Hama)
The IC-705 can accommodate the RHM-12 with a special bracket. I was hoping the KX2 (and possibly the KH1 too) could also accommodate it. Maybe a right angle PL-209 to BNC adapter and a 3D printed support could work as strain relief?
Great work with your set up and I just love that photo. What a view!