Kabong,
I've had several aluminum dovetail mount plates on my P-09/P-07/97B"E"/75B pistols. Mine are Springer Precision for the Burris FF 3. I also have two 507C red dots and one 507K on my optics ready P-10 pistols. The K and C sights are definitely different. Check with Springer Precision and EGW and see if they are making something now for the 507K in the 75B dovetail dimensions. Sure, aluminum is weaker in the threads, but mine have been fine for 7 or 8 years and some pretty heavy use.
Joe