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Having the wrong length of nodal slide is a common problem if you use one with a built in clamp at the end. The various Really Right Stuff combinations that have a movable clamping position allow you to adjust the camera location to get the end out of the way of either an interference, or also out of the field of view of a wide angle lens, but still allow the "nodal" point to be properly clamped. The 192 kit referenced above uses their thicker heavier lens plate, and is shown here:
You can also make your own 192 style package with a thinner lens plate from them to save a little weight, but you loose the level.
And the lowest cost solution based on what you all ready have is going to be the extender mentioned above, which should give plenty of room for your filters. Note that the extender block can be clamped at the bottom in any of 4 orientations, so you can align the top clamp the way you need for mounting a camera for a nodal slide function.