But even if we consider literal forced vaccinations, I still don't see that as necessarily inconsistent with libertarianism, due to the reasons I outlined, specifically the non aggression principle.

Suppose that a new disease emerged that had a mortality rate of Ebola and a transmissibility of COVID. Suppose we had a vaccine that was capable of stopping transmission. In such a rare and extreme set of circumstances, forced vaccination (not even mere mandates in workplaces) would be a must under the NAP. The right to choose not to vaccinate is effectively the same as the right to kill people with a disease that you may carry.

Luckily COVID isn't as deadly as that, and the vaccines aren't as effective at preventing transmission, so we don't need to consider such measures. But in the right context, I very much see forced vaccinations as following from libertarian axioms. Just like you would see jailing a serial murderer and depriving them of their liberty to be justified under those same axioms.

For the record, I'm one of the most anti-collectivist people you'll meet. I just pay significant credence to the reality of negative externalities. You can swing your fist all you want, but you can't punch my nose with that fist. In the same vein, you can't cough your deadly virus into my face and not expect to justly have force applied to you.