Interesting problem. I'll start with saying I don't know anything about the gun. But is there such a thing as a "single" cantilever mount so you don't have the base crossing the ejection port?
Maybe?
https://www.opticsplanet.com/safaril...ing-mount.html
Would the base of this one protrude over the ejection port?
https://www.opticsplanet.com/aero-pr...mount-spr.html
I know it says Remington 700 but would these work?
https://www.opticsplanet.com/leupold...med-matte.html
Another possibility?
https://www.opticsplanet.com/nikon-p-series-mount.html
I think that's all I got!