Mildly related, but I have been waiting for goldeneye to be decompiled for a while but before that process has finished there is has been a spiritual successor(?) made that has scratched the single-player itch for me: https://store.steampowered.com/app/1574480/Agent_64_Spies_Ne...
Worth a look if you want a bit of nostalgia.
I saw some news last week saying the project had reached 100%. Looking at the git repo (https://gitlab.com/kholdfuzion/goldeneye_src) that claim is a bit harder to verify, but maybe look again?
If you are interested in the "sequel", Perfect Dark, then there is this PC port based on the decompilation project that plays great:
https://github.com/perfect-dark-pc-port/perfect_dark
Ported it to OpenBSD for fun an evening about a year ago.