I have seen other versions of the RB, it is a novel idea in theory, the problem I see is all the mechanical parts, hinges, springs, bolt, etc. can come loose then you have items that would jab your Horse and cause severe damage, that is what has happened with the RB.
If the angles of the bars in the Saddle are not too bad, a built up pad may work in adapting your current Saddle.
Can you take some pics of the current Saddle on your Horse without a pad, lightly cinced, show how the Saddle sit pertaining to the wither area?, that would help to find any options.
May all your Trails be happy and safe ones