Being approx. 14yrs old this model has not been supported for some time now.
The chance of finding a keypad I would have thought highly unlikely.
As for finding another keypad to work with the Super, I'd say no. Keypads (RKPs) tend to be specific to the control panel so no luck there I'm afraid.
I would suggest ebay is going to be your only chance, other than that, a new control panel.
Not as daunting as you think, all the detectors cable etc should be useable again, you've just got to find the right person to do the panel change.
Good luck
acorn
May 2010