What are you talking about (tinkering to run unraid on your QNAP NAS)? How much love does any OS need so that you’re satisfied?
QNAP just released the new QTS 5.0 – but obviously not for no longer supported EOL devices like yours.
Update: While your hardware might still be fine if you can find an alternative OS that runs on it and is still supported, Nigel Hough’s hardware is different and IMO not worth the effort. But that’s just my opinion.