Hmm, true. I think the two options then are either 1) have one set that can be changed that are system-only, and then just make the themes available when first created as normal styles as well (which would probably be more backend work), 2) accept that it's only going to be an approximation that is never going to be 100% perfect to how things exist or 3) make them unavailable in any form as 'useable' thems (though I've had three people already tell me they would use the Basic Boxes version right now if it was in the system)