Just for those whom might not know, the pcr does share the same sight cut as the 75, the pcr will just have a small "shelf" of metal missing in front of the sight.
On my pcr I run a green f/o front and for the rear a CZ custom HTAC. I can't stand 3 dot sights and those TFX drive me crazy.
On my second pcr it runs a CZ custom rear that covers the shelf and brings the face of the sight to the rear of the slide. Have you thought of just buying the TFX front and modifying the rear?
Maybe even call Dawson precision, I asked about a custom rear sight for a M&P, slightly taller and wider notch, an extra 10 bucks.