Steve Cramer wrote:
the shaft will still have the indexing offset.

It may have. If the index is only on one hand, there won't be a
problem. That would mean, of course, only adjusting the non-indexed blade.

Rather than cutting a one-piece that's double indexed, just buy a two
piece, adjust to the angle you want and glue it in place. Use of hot
glue will allow future adjustments by reheating the joint and loosening it.

Of course, if you cut the one-piece or glue a two piece, you lose the
advantage of having a one piece in the first place - higher strength to
weight.

Mike