This Mainspring Seat is made to utilize the E2 style Hammer Strut, so should easily accommodate the Sig Armorers Super Strut, as it's extra length is below the frame support lugs, to accept the screw that attaches the funnel. Of course your frame needs to be cut to accept the funnel as well.
Grip wise, you should get the P226 X5/X6 Series Hogue Grips that are cut to accept a funnel and fit flush with the top of the funnel... Extreme Series G10 - X-Series DA/SA Allround - P226 X-Series - P226 - SIG SAUER Grips - Handgun Grips - Hogue Products (hogueinc.com)
Here is how the grips are cut, to accept the funnel...
Grip wise, you should get the P226 X5/X6 Series Hogue Grips that are cut to accept a funnel and fit flush with the top of the funnel... Extreme Series G10 - X-Series DA/SA Allround - P226 X-Series - P226 - SIG SAUER Grips - Handgun Grips - Hogue Products (hogueinc.com)
Here is how the grips are cut, to accept the funnel...