Anyone have a good bag rider solution for the Sidewinder?

I'd really like to add a bag rider to my Sidewinder, as it would help greatly in benchrest accuracy testing, as the gun is hard to shoot well from the bench and the trigger is not so great on these - if the gun could be better stabilized, I could focus all my effort on the trigger pull rather than splitting it between that and stability. It is fine from the shoulder, but I really want to test for the best accuracy for different ammo and tunes on the bench taking me out of the equation as much as possible.

I see K&L makes a buttplate for the LCS, and while it looks like it would fit I have no idea if it really would. While I'd prefer not to spend that much for a solution, I suppose the lower arm could be adjusted to work as I would like. But the ideal would be something that could be easily added to the existing Sidewinder buttplate.

Any thoughts?
 
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Here’s the thread showing my design for the LCS-

Send a pm to ORION as he made it for me