As far as I know there are no aftermarket turrets for the Falcon that utilise the central screw. There is the one that Rowan make that clamps via grub screws.
I find that using the MRad clicks is pretty easy in that the turret is marked in 0.5 MRad increments so 60 clicks is marked as 3.0 on the dial, 30 as 1.5, 10 as 0.5 etc. It's much easier than the usual 1/8 MOA where you need to remember your 8 times table
I found I needed a large turret on my big Nikko to mark the yardage on but I haven't needed or bothered with it for the T50.