How reliable is "Revert rig back" in RigSync?

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I'm taking an FLX-S into a new venue (for me) which has (or had) 48 ways of dimming, some channels of which have been modified to hard power a couple of dozen RGBW washes, brand currently unknown.

I have the choice of reverse engineering the patch using my DMX-Cat (and 96 faders on the desk) or throwing caution to the wind and turning on RDM, however I am mildly paranoid about munging the settings and not readily being able to restore them afterwards.

I've played with RDM in my main venue with an FLX but found it somewhat problematic, especially with flickering on cheap fixtures.

Am I right to be cautious?