Good luck with the move. One thing I would consider is that he will be one of the only ones living out of catchment, if you did get a request approved. So you driving him to a school much further away would have more repercussions than it would in England, where one neighbourhood might make a lot of different choices.
Schools are not separate from the communities, you don't tend to find two that are really close but miles apart in quality (however you would measure this). Instead, the schools tend to represent their catchments. You don't find good schools in bad areas or vice versa - if you are happy living in an area, then you tend to be happy with the school.
Your DS would stand out if he was deliberately going to a totally different school, some distance away, both with the people you live near and his school friends. You'd need to find a good line in answering people when they ask why. One child in my DSs class is in this position (also moved up from London and rented for our school for a few months before buying far away) and he misses out on all the ad hoc plans made on a sunny day to go to the park, never walks with anyone, his mum can never just pick someone else up or help out as easily with things at the school, she isn't part of the local community in a way that I find extremely valuable.
It's clearly up to you, but I wanted to draw attention to this difference, as it's something that you wouldn't realise you were missing until it was too late to fix.