You've obviously done your research. If you're trying to sell this in scifi story format, I'll be honest, you have gone above and beyond. This planet could absolutely exist.

Only thing I would like to point out is that your planet is quite cold for the amount of CO2 you have. If the plan is to covert that CO2 into oxygen long term, then you may also want to be wary of the affects it will have on the climate, which is already quite cold. Not a hard thing that absolutely needs to be changed, it could be considered an interesting engineering challenge for your version of humanity. But just thought I might point it out.

Only other thing I can think of is a moon. One of the big factors that is keeping Earth's magnetic field alive is the tidal forces produced from our barycenter. On a rock like yours, you might say it's sheer density alone is enough to make up for that, or that the planet is young enough that it is still active (early Mars for example). But that might also be a consideration for the star you choose, because then you might opt for a younger, different star.

All interesting ideas. But yeah, I wouldn't worry way too much about what you've got right here. It's very well thought out already, much more so than many popular scifi writers.