Congratulations on the launch! Just ordered two for a couple of my ultimate build plans that have been on my mind for a long time...
Really need to get a handle on my spraying and finishing skills, it feels like it's the only thing holding me back from completing a handful of projects.
The pricing is a bit steep with import duties and taxes on top, but at least you're not charging UK VAT like some do... With the discount it makes out to be approximately what I'd pay for a new Mastery from the store, so that's not completely out of the question, but the regular pricing might be a bit prohibitive all things considered. I do realize there's probably a decent investment going in to all of this, of course.
A slightly cheeky promotion idea came to mind; the guys at That Pedal Show have had a show with Johnny Marr not too long ago, and got gifted one of his signature Jags. One of the main guys in front of the camera, Daniel Reinhardt, has apparently taken to the guitar (being a long-time fan of telecasters), but went off and replaced the bridge with a Mastery because of "problems" they mentioned offhand at some point. Sending one off to them and suggesting they'd try it out instead of the Mastery might be a good way to grab some attention
Having looked at different 12 string bridges and ideas for a while, it could also be cool if you'd design something for that space. There's been an offset-style Coronado bridge on the market at some point a long time ago, from what I gather, but these kind of solutions seem to be completely impossible to find. It's probably a niche market, but perhaps a lot of the existing work could be reused, especially if you were doing something for a non-rocking solution?