After some consideration, I decided to "graft" the problematic pieces......
First, I cut some pieces I had left over from the neck scraps.
Then I routed out the sections.
I glued together the 3 pieces with CA glue, shaped it and fit it.
I glued in the single piece first.
Then I glued in the the bigger piece.
Here it is before filling, once filled, it will look no different than the 24th block.
While I was at it, I got the trussrod cover done too.
I drew out the areas, in which I would drill for the set screws.
After drilling and putting the screws in, I put the magnets down, so I can glue them to the cover.
Here it is, on and off....