I just did, got stuck around 3 when I rebooted to recovery again, stays stuck at unlock bootloader screen, that's it1. Wipe flash oxygen os, flash twrp, reboot recovery
2. Flash oxygen os again, flash twrp again, reboot recovery
3. Flash Siberian OS, flash twrp, reboot recovery
4. Flash gapps and magisk.
That's how I would do it for a full clean install.