I could've sworn I'd seen some with t-o-m on the forum. There is an aftermarket plate I've seen online that effectively makes it a hardtail.
As far the Bass VI, I have my own theories/opinions as to the limited options. Like raw necks, stainless frets, and shielding, if I spout them enough they will become accepted as fact. The Bass VI neck and body Warmoth makes isn't interchangeable with a Fender body or neck. I think they want to make one, but for whatever reason they didn't make it Fender compatible, probably weren't allowed too. I'm just speculating, but once given a choice of neck, fretboard, body, even lam top wood, why would I buy a Fender over a Warmoth Bass VI? Oh yeah, the Warmoth comes with that hideous bridge too. Visually, the Warmoth is superior, but functionality is the same, and Fender wins that price war. As is Warmoth's Fender stuff is strictly parts, that is, Fender wants you to build a halfmoth. The Bass VI, kind of being in novelty purgatory land, Fender can't have the most competition for an already small niche market come from a company they license to make parts.