Airforce Texan long arca accessory rail?

Would love to mount a long arca accessory rail under my Airforce Texan SS 457. Rail attachment ideally stretches from trigger guard to about 6 inches past SS shroud dovetail mount. Hoping to attach arca quick release for tripod, bipod, IR light or FX pocket chrono. Want to keep it tactically simple and lightweight rather than the full maddog stock solution.

Two point rail attachment bridging longer forearm bolt to shroud dovetail? Add shroud band near muzzle for 3rd rail mounting point?

O wise and powerful airguners, please share options.