Yes, there are solutions to this that don't expose the whole kernel to
root.

 * This project's kernel module could use DKMS. This could make use of the MOK 
workflow already present in Ubuntu.
 * This project's kernel module could be included in the upstream kernel.

The last option would be more secure, but more difficult to achieve.

I don't think this can be solved in Ubuntu, so let's continue this
discussion in the first upstream issue you linked. (Although I'd
probably need to take a look at the source code and I don't know any
C#.)

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https://bugs.launchpad.net/bugs/1851380

Title:
  root can lift kernel lockdown

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