You get great points for persistence. CNC routing setups start at
$6500. Carving a twist like that would take considerable practice,
especially to get the thickness consistant around the whole twist. If
your'e interested in carving, go for it!
I havn't tried it, but I bet with the right form(s), a lot of clamps,
bandsaw to resaw your board into layers, some polyurethane glue and
some practice, you could do it without the glue lines really showing.
Need to keep the boards in the same order they were sliced off. Tune up
the bandsaw on scrap 'til you have your slabs consistent in thickness.
Though the layers will be rough from even the best blade, the peaks and
valleys will match from board to board, leaving a near seamless glue
line without having to sand each piece (I have tried this part). You
might want to do a search for David Marks, host of tv show "woodworks".
He has done other bent laminations on his show and I wouldn't be
surprised if he hadn't tried a twisted one. See if he has a contact
link on his site.