I've been using this method for years and it works great. It uses a windows debug feature to launch cmd instead of the reboot scheduler. You never see the cmd window, as it's launched by SYSTEM. This prevents Windows update from scheduling a reboot, otherwise the system function as normal. You do need to reboot periodically, but now it's on your schedule.

Source: https://lazyadmin.nl/it/how-to-stop-automatic-restart-win-10...