I've spend hrs looking for another mount similar to the T-REX but to no avail.
Actually ordered the mount with Claude the same week the manufacturer passed away.
So after researching I ended up buying the DM6 mount from discmounts.
One beefy unit, in hind sight probably should have got the DM4, but I only use this at home so all is good. Different to use as it doesn't have slow motion controls, but very smooth and accurate, ordered with encoders.
For travel and a grab and go I use the Manfrotto video head. ( for Fsq85) on its weight limits for that scope but enjoyable to use.
Good luck!