Default [Q] Any Updated 8.4 Wifi Stock Rooted Roms for Flashing?

Hi,

I was wondering if there are any updated (from the latest update) 8.4 wifi stock rooted roms that can be flashed in a custom recovery. If there aren't, would anyone be interested in making one?

Failing that finally, is it hard to make one? Does anyone know how to do this, or could someone outline the general process for doing so for me? I'd just hate to add a custom recovery and then be locked out from future upgrades!

Thanks!