Opinions please - Ferrite on safety ground

The tightly looped ground connection (with or without ferrites) will present a high impedance to a direct, or nearby, lightning pulse which is searching for the "easiest" path. What you DON'T want is for the easiest path to be passing through your equipment. IMHO, both the RF ground and the safety ground should be as straight and stout as you can manage, and bonded together at one point (preferably outdoors.) Ferrites on individual AC power cords (and even tightly coiled power cords) can be a good way to reduce noise levels, but I would stay away from trying to "filter" any ground wires.
Unrelated to your question, but I would suggest testing the DC power supply for continuity between the Negative terminal and the AC ground. This is how most Astron linear supplies are wired, and this can mess up your plan to keep the RF and AC ground paths separate. On an older Astron RS-35A, I found (and clipped) the Neg-to-Gnd wire at the large electrolytic capacitor. On a newer Astron VS-50M, the Neg-to-Gnd wire is at the back panel output terminals. I disassembled the output terminals, and moved that wire to the outside of the case (dangling from the Ground **** - just in case I might need to have the Negative lead connected to chassis ground at some future time.)
One further suggestion - add a good Surge Protector to the main AC breaker box (the ones that mount in the panel like a double breaker have the best chance of stopping an inbound surge at the panel.)

Andy W3DQS