That's not quite descriptive enough. You say you've got air gapped storage, and printers... are the printers part of the air gapped network? How is this any different than any other networked printer?

2FA would be helpful here for evil maid protection.

Not quite what you asked, but here are some thoughts.

Do you have the sales "fire power" to sell this solution?

Because it sounds like the kind of thing that governments or complicated companies would potentially buy. And they are not easy to sell to, to put it lightly.

I used to have some startup ideas that are in this category => "Most people don't need or want it, and people who do need or want it are not going to buy it from my flimsy bootstrapped startup (they will take 2 years and spend 100M with Deloitte on it instead)".

Not sure what's your situation/size/funding/scale but personally I'm happy to stay away from that category.