write it down on paper with a pencil. it’s a pain, but you won’t have to rely on any chip to remember it for you.
Better use an NFC, because you are going to need to import the key to a client everytime you need to post, like or zap.
idk, it’s all a hot wallet in my mind if the key can be “imported” like that. before owning a hardware signing device, i just keep key copies to a minimum, and don’t use more than one Nostr client