Use a Trezor. Reset the device....get a new seed created and use that to place under the Holo and use the corresponding public address for the loading part.
You can then reset and do as many times as needed to get as many new addresses as you want made.
I think that you can add Ledger too to the list. It has same property: enter wrong PIN 3 times in a row and you can generate a new seed.
Plus this can go in other places too, not only collectibles, since people still want to create their own paper wallets in a way or another.
I would add a live OS stick (Tails?) too as an option for easy setup, since the computer setup you wrote can be tricky, traces/files will remain there for when one restarts WiFi / network.
However, great initiative and nice tutorial!
Thanks for the feedback all.
I posted what I use and recommend...and am expecting others to chip in what they use.
And the air gapped computer will never ever go online...when the day comes that I do not use for the key generation...I will be destroying the hard drive and all parts of the laptop. So I am not worried about any wifi network restart...thats why it has to be dedicated striclty for this without the thought of using it online down the line
Ans yes a ledger can be used the same way as a Trezor, I just love my Trezors and use them exclusively even though I do have ledgers which I keep as part of my Bitcoin collection only never to load in any way.