I use a product that you may not be aware of.
Micro Mesh makes an ultra fine sanding paper that ranges from 1500-12000 grit.
It is available is squares mounted on foam and sold at work working stores.
I use it at the very end of making a reed to smooth out any irregularities in the scraped area and to thin the very tip of the reed.
I always end up with a tiny “speed bump” at the very tip of the reed and this removes it safely.
Tim