Actually, since posting my last comment here I have created a plugin that does this. However, the plugin can slow down your admin and it’s not really a good idea unless you really need it. You can dig through my code and implement it for your specific fields on the site.
Like I said, while I build this I would not use it as it will run JS on every choice field in all field groups one the page and it would be better to target only your specific field. For example, targeting a specific select field would look something like
// replace data-key with your field key 'change [data-key="field_12345678"] select': '_custom_field_location_change_select'
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