A note regarding fwctl support:

Generally as of mstflint 4.32, some of the functionality, and
specifically firmware loading, can work through the new fwctl
interface and does not require the separate mstflint_access
from mstflint-dkms.

This should work, unless you use a custom kernel older than 6.16 (or
backport this package to an older version of Debian), it should work.