The point exactly, I need not to stress myself and waste yet another penny or effort in buying some chemical or metal work material to destroy whatever have been ached on the steel plate. I’ll just create a brown new non custodian wallet, get my keys properly backed up in a way to get my peace of mind and transfer the coins into the new wallet.

I’d not see no way anyone would be taking my coins after I have successfully transferred them to a new wallet. Perhaps I might even get the metal sold off as scrap metal for the scrap guys.
We’ve got these easily means to navigate and I’ll use it good in this context.