I'm sorry, but this whole discussion has been solely versed with nitpicking on particular variants and obstacles, it's nothing new ot the argument, and I can assure you, you still have not covered all your bases.
What if Obi-Wan was to use the Force to send the convoy into a false alert or similar. Perhaps get the word out to Republic Security Forces to distract them and divert there attention, maybe just pull out all the
weapons from there hands;even if you care the silly superhero Jedi talents, unlike me, he deflects fire with his hands in the Clone Wars, he could do that.
Obi-Wan is a Jedi and will do what he can to sustain live, however evil or corrupt it is, and when there's a Jedi around nothing is impossible. The Maul incident occured when Obi-Wan was young and reckless, and in an act of revenge, he called upon the dark side of the force, not some darkness within himself, to fight back against Maul, and in that instant, he was no longer a Jedi, he was no longer in control, and could not uphold his principles and spare Maul's life.
Plus, Obi-Wan's shown no displeasure at hacking off a few limbs when the need is there 🙂