If I read right, your customers are going to give you the length of the spiral they want ?
Good grief.
So potentially every one is different, so a spiral jig is out.
If you do go the cnc route, then I'd suggest using the outside "waste" area as a means of securing the block down to the machine base. (This at least could fit into a clamping jig if your blanks were all the same size.)
Then leave small "tabs" at intervals across the spiral to support them when you cut the second side. Remove these by hand as part of the finishing process. You would also need to leave just a few small tabs on the outside to secure the spiral to the waste wood, rather than try cutting it out completely, with disastrous results.
John
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