Keeping it original is no bad thing, but if you intend on using a c5 for the meetings or events then converting to a c5alive wiring kit could make more sense. The original keyswitch assembly is now 26years old and not getting any younger. They're known to get temperamental in use causing power cut-outs and the battery top needed to accommodate the keyswitch also restricts your choice of battery.
A c5alive power wiring kit is a simple "plug and play" conversion, meaning no permanent alterations. Most of the c5's at the meetings we hold are running on c5alive wiring kits mainly due to the ease of fitment, improved battery choice and added reliability.