I just got mine to work First, I have my rig pugged into a smart switch that can be scheduled to turn off and turn on when I want. Then I use the scheduler on HiveOS to shut down my rig 5 minutes before my smart switch turns off. Finally, I set my bios to boot when AC turns back on so that when the smart switch turns on the rig reboots just fine. Easy peasy!
P.S.
I realize that the OP said he didn’t want smart switches, but I figured that was because he didn’t want to damage his rig by cutting the power while the rig was running. With my process the rig is already shut down by the time the smart switch cuts the power and none of the electronics should be damaged. I’ve done this process manually without the scheduling for a year now and my rig is still solid.