I'm sure you're on it, but beyond the marketing aspects of a "common name," I think there's value in nostalgic part numbers. These are going to be exclusively in the hands of FE folks anyway, so something like C*JB-6090-* would mean a lot, especially as your designs evolve.
That said, I lean toward something like J482. There's your J, and if current trends hold, I bet a LOT of your potential customers are in the 4.25" club or wouldn't mind the association.