The point links solution still sounds good to me. You'll need an SSH data point for each RFID point I think. Then you can just hardcode the door number either into the pointlink or the ssh point. I would opt for the point like, and set the SSH point's value to something like "RFID# Door#" and stick with the ssh points' set commands being "key=$(/path/to/validation/script.sh VALUE)" as the string VALUE will be replace by our two arguments for the script.
Each RFID point will have a point link to an SSH point (and all SSH points can be the same, but for the sake of event handlers (if Mango needs to track state beyond just issuing a single open to the doors). Door 1's pointlink may look like,
return source.value + " D001"
You may need to check for an empty source.value and such. You can use all the same control logic from my earlier posts, involving another chain of point links from the SSH points to their relays.