Hi,

As you might know, I'm the NASM maintainer. I'm also a pretty avid Emacs user. I thought I might help by making it possible for the token lists to be automatically generated, so I added a Perl script to do so (misc/emacstbl.pl) and put it in the "emacs" branch of the main NASM repository, https://github.com/netwide-assembler/nasm.

It probably takes a bit of hacking to accept the output of this file, and I would certainly accept changes to the script as needed, but I would suggest using (require) to load this file separately from the actual code, to decouple it from maintaining your code.

I have attached a sample output.
nasmtbl.el.txt