Works already been done for the most part. Mixtral is to GPT what Linux was to Windows. Mistral AI has been doing such a good job democratizing Microsoft's advantage that Microsoft is beginning to invest in them.
Click "Learn more" under the big "Committing to open models" heading on the homepage. Then, because their deeplinking is bad, click "Open" in the toggle at the top. There's your download link.
/I'm too old to fight that battle again...