From what I understand,
all Rosewood (and tree varieties with the same genus) is on the CITES class II endangered list. India asked for a 6-month delay on the application for their rosewoods, so for Indian woods that doesn't kick in until the beginning of August. But it mainly means that for the moment, the rosewoods (and similar genus woods like Bubinga) will still be available, but will have to be properly documented at all points of import/export, including their use in finished products - like
kit guitar necks. So any exported kits will need a certificate for the rosewood used in the neck. I don't know how much extra work or cost will entail you, Adam, but it might make the kits more expensive to export.
Obviously the move to put all the rosewood family on the class II list shows that supplies are dwindling globally and needs to be very well managed to ensure continuing availability.
I'm not that fussed about having a wood with similar properties to rosewood being used on necks, as long as it has a similar feel and long-term fret retaining properties. I do have an old Gibson acoustic with a fabled Brazilian Rosewood board, and to be honest, it's nothing special.
I'm not ready to make my own necks yet, but I'd be happy to have a small length of the Blackwood, enough to try fitting a fret to. That should give me enough to get an idea of feel and workability. Maybe if only 3 people want to build a complete neck with it, you could saw the other piece up for smaller samples?
Are the Chinese calling this treated wood 'Blackwood' themselves, or is it really an African or Burmese Blackwood (which are both in the rosewood family so covered by the CITES changes and rules) or an Australian Blackwood (which is an acacia so exempt) or a totally different wood that has been heat treated to darken it that they have given a name to that could cause confusion at import/export time? They might want to reconsider the name and call it something more unique!