If you’re doing a lot of these pieces then yes, some custom workholding would make more sense. Don’t discount the Scotch tape & CA glue for holding odd shaped workpieces though, it works way better than you expect.
There’s various designs of clamp, quite a few in the ‘cam action clamp’ category which people make on their shapeoko.
There’s a load of options here
https://wiki.shapeoko.com/index.php/Workholding
and stuff like this
Any of those work?