I simply do not know where to start!
You obviously need educating in the sequential steps of becoming a head teacher.
'One' does not become a headteacher simply because an opening has arised near to where 'one' lives.
There comes a period of which a 'candidate' has to have several years teaching experience.
Then comes a period of when a 'candidate' has to have several years of senior leadership experience; firstly middle managers such as HoD, KS leaders and secondly assistant head or deputy head.
When a 'candidate' has gained a good number of experiences leading a school when the HT is off premises, then said 'candidate' is often deemed ready to apply for headships.
I suggest you take more of a close interest in your DH's job, and that of his own HT, to understand the constraints, commitment, experience and sheer damned hard work (not forgetting it IS NOT family friendly) that is required from a HT.
Then maybe you can see that you are being VU for even having a moan about your DH not wanting to commit to such a demanding job when he feels it either isn't for him, or is simply not the time yet.
Why on Earth is it so important to you that he takes on the role of a HT? Believe me, it is not some sort of luxurious, gold-plated job to brag about.
There is a reason why there is a shortage of HTs nationwide. i suggest you look into it.