This is actually the red envelope in which the paper wallet goes in, and funny enough i already did a design of Euro but with Bitcoin twist for a paper wallet 
you can check it out https://hongbaob.tc/en/papers/144?step=1
This is interesting design you made, but these days I am not comfortable having private keys printed on anything.you can check it out https://hongbaob.tc/en/papers/144?step=1
I know some scary stories from customs in different countries opening packages and envelopes, so that is a security risk.
You should consider adding some alternative for private key, maybe separate sticker with private keys that can be printed locally.
The idea is that you print that yourself, and with each envelope you buy you get scratch-able sticker to hide the key and mnemonic, so only you and the person you gift it it to can see it
But the whole paper is printed at home, we only sell the envelopes