I don't think Jack will sell you a bolt. If all you want is to see what these types of bolts can do for you try the Cooper T
website. All their bolts are the "undertow" style just like the Alien bolt. Just a matter of finding one that fits in your ego and then as you said, mod it from there.
The thing with the Alien valve is that it helps get the most out of the bolt. So, if you get a Cooper T (or an alien) bolt you're not going to necessarily see what an Alien marker will do. Either way, sounds like a nice project.