PCP with Long Pic Rail for NV Clip On?

I shoot a lot of powder burners and have several NV and Thermal clip ons that are designed to clip in front of a traditional day scope. I would like to use them on an air gun, but the only air gun I can find that has enough rail space is the Benjamin bull dog, and that’s not really my speed. It doesn’t have to be a factory solution, I know there’s a big aftermarket out there and surely I cannot be the first person that has ran into this issue. I currently have daystates but I’m not afraid of trying a different brand if there’s no solution for my daystates. Thanks! 
 
KL makes the GigaRail for the Impact--will be close to what you're looking for. Pictured with a USO TS-20x. 

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