I agree with Darth 100%!!!!! No need to buy a hardware signer. If they are already familiar with how to use a bitcoin wallet and just looking to take the next step in security, get them learning how to secure their seed/key backups.

If you want to include a device (playing around with backups isn't terribly fun), get 'em going on a node. Any old laptop will do. You can run Bitcoin Core (or Knots) on whatever operating system you like (Windows, Mac, Linux). You don't have to be technical. It's pretty much just download and install.

There are lots of great tutorials about how to connect your wallet to your node. Most wallets make this pretty easy. It'd be a fun experience and they would probably learn a lot.