Bedpost fractures (spiral fx of the proximal phalanx) are pretty common place (usually see at least 5 per week, 1 just a few hours ago). They almost always heal uneventfully, but a small percentage do end up with a non union and chronic pain. What most patients balance is the benefit/risk ratio of continuing to run before it heals (which takes around 6-8 weeks in most). First, the walking boot is definitely overkill for a 5th toe proximal phalanx fracture. Second, if my own wife or me, I WOULD run before 6-8 weeks if pain would let me (let pain be your guide type) since most runners are able to and the “benefit” for me would outweigh the very slim risks.
Best of luck.