I emailed Xyne, the creator of `reflector` about what would need to be done for ARM support:
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')Reflector is developed for the offical Arch Linux mirror status page and expects the mirror data to be in the same JSON format: https://www.archlinux.org/mirrors/status/json/
You can use the "--url" option to point it to a different mirror status page, but the format must be the same. I had a look at the ARM mirrors link that you sent, but I don't see any JSON link on that page. You or someone else will need to write a wrapper that generates the ARM mirror data in the expected format if you want to use reflector, or you will need to convince the ARM devs to provide it.
Regards,
Xyne