I thought the goal was to erase region 41, not 34. Erasing 34 will keep the same UnitID as it will be coming from region 41.

I would suggest to do those 3 commands at the same time:

write region 34 with offset 0x10-0x1f with FF, keep UnitID intact.
erase region 41
reboot

That should wipe clean your NVM and preserve your UnitID.