I actually have a fair quantity of these GGG modified units made and sitting on the shelf. I was waiting to offer them when / if the newer version of the interface was released, however that interface has taken a back seat to a number of other projects. I'm afraid my answer to any emails asking when the newer GPWiz49 version would be available would simply be "I don't know".
If anyone is interested in a good 49-way balltop with a replacement stainless shaft (got some nice colored tops coming soon as well), that works great with the current GP-Wiz49 interface, then they should shoot me an email stating so. They aren't cheap sticks, but nothing feels like a good rubber grommet stick. I personally will use nothing else.
RandyT