I have to say I was intrigued by this and sorry I missed the option in the 2011 model, but I did get a SS sink so it's the old fashioned key for us. In looking into this mod and based on the relatively low production it seems that the one being used on the Jayco is manufactured by Tri-mark. At least it looks like they make a majority of the hardware found on my rig. Plus the picture in the earlier post looks exactly like the keypad on their site.
I can't find it anywhere for sale outside being a manufacturer and it seems to be a fairly complex mod for installing on an exisiting keyed lock without a powered actuator. But for those of you that might want to try here is the link.
There's always the next one's must have list...you think you thought of everything but every year there's a new thing...