Moring Jake, hope you aren't getting an ulcer over this.
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I was reading over Sadler's thread on his action and he ended up getting an extra spot milled (not shown on the photos in this thread) to accommodate the sportsmatch recoil pin due to the shorter dovetail, that would be a very easy addition to address those rings, if some of the rail isn't retained I'd strongly advocate you consider milling an extra hole.
The only con that remains (and this affects the UM rings too) is some scope bodies are shorter and Sadler said the NXS compact (if I recall correctly) couldn't straddle the larger port, not sure if retaining that red corner in my sketch would address that (I don't have a that scope sitting here to review), not sure if you got a way to cleanly leave a bit more of the dovetail?
Opening the port more on the side, AKA "sheep port" that is being advocated for here is a separate issue but I captured it in this discussion. Either way please consider one of the above options to simplify SM ring usage.
Attached are a photo of Sadler's action with the extra pin spot. Also I'm sure you've likely seen Dioni's action already but here are some photo's he's posted up where he retained that portion of the dovetail, it doesn't look bad once a ring is on it.
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Thanks for the hard work, hope to see a chef's kiss put on this design.