"And if I press this button on the CNC machine..."
The beavertail is totally superfluous. Especially on the models with the reduced trigger reach.
I wouldn't worry too much about a frame on a new gun cracking, but they do wear out faster than the stainless steel guns. Also easier to shoot the stainless steel guns due to the mass, obviously.
But longevity in 9mm isn't really too much of a problem since they sorted the trigger bar spring problem out about 15 years ago.
Anyway are your hands really so small that you want this model?
Secondly I think Sig needs more improvement with the SRT.
Another overrated widget, the real problem with American-made guns is that a lot of them just have crappy trigger pulls compared to the German guns. How fast it resets is pretty academic if the let-off is lousy.
Having shot dozens if not hundreds of IPSC matches over 20+ years using SIG-Sauer pistols, the trigger reset speed is not something I've ever really been concerned about. First time I tried the SRT I was expecting big things but it's not a patch on the trigger mech in my German-made sport models.
If I were you I'd buy the standard gun with night sights, and get Dlask to do a trigger job on it. Standard gun with stainless steel frame if you can find one, P226ST or whatever it's called.