If you are in Asia you might have luck asking around for a 360c remake PCB on other forums. Someone associated with matrix lab made one years ago and it ran as a GB on Taobao afaik. I haven't seen any of them leave Asia though except for mine.
Heres mine:MoreShow Image(https://i.imgur.com/3oJ6D2I.jpg)Show Image(https://i.imgur.com/L0oVCFm.jpg)Show Image(https://i.imgur.com/iyZN7pt.jpg)Show Image(https://i.imgur.com/DbT4408.jpg)
But yeah this is probably your best option as you have found:
https://geekhack.org/index.php?topic=100198.0
Fingers crossed it happens, because the PCB I have doesn't have programability.