No need to apologize

I believe what you are wanting to do can be accomplished via Mapped Key Virtualization, at the Character Set level. The one caveat is you MUST have a "master" mapped key for the key you're going to virtualize, because the virtualization is interpreted by a Do Mapped Key Action (or anything that does the equivalent, like a click bar button) -- in other words, the Hotkey is still going to activate the original Mapped Key.

So what you do in the case of your 3 key... for example if you are using the FTL DPS Keys map, you have a DPS 3 Mapped Key, with the Hotkey set to 3. You would drop the Hotkey entirely from DPS 3, and make a new Mapped Key, with Hotkey 3, and a Do Mapped Key Action pointing to DPS 3 with target=self (note that the Target for a Do Mapped Key Action effectively controls who presses the Hotkey to activate the Mapped Key, NOT who gets the Actions mapped by the key, so if you were to set target=all, every window would tell the others to assist and press 3, instead of the current window telling the others to assist and press 3). Then you can effectively replace DPS 3 at will, for any particular Character Set (virtualization can also be done at the Character level, but you'd need to change the mapped key around a bit). To do so, go into your Character Set and click on Virtual Mapped Keys below Also Launch. Make it read, for example, DPS 3 in FTL DPS Keys is now RR DPS 3 in FTL DPS Keys. Neither of the Mapped Keys needs (or should have) a Hotkey. When you use the master key with the Hotkey that does Do Mapped Key DPS 3, it's going to do RR DPS 3 instead.

Hope that wasn't too hard to follow. Enjoy