If custom is an option, <a href=http://www.kingbass.com>David King</a> is a luthier who only (as far I know) does headless basses. I don't know what the situation is on whether he'd do just a neck, or if he does graphite, but it's worth a try. Other companies you might consider who do graphite stuff are Zon, Status, and Steinberger (the latter 2 do entirely graphite basses). If these are avenues you've already gone down, sorry I couldn't help. Good luck
