Cool idea, and great use of BIP38 to get around the issue of you also having the private key... I'm in for 3! 
Will you print different icons on them depending on the token choice? Like if I want a ZEC one, I'm assuming you'll print the Zcash logo on it? Also, how are you etching them? I also have a CO2 laser cutter, so I'm assuming you're treating them first with a coating, then that's actually making the marking (similar to dealing with anodized aluminum)... Do you have any issues with it scratching off?
Will you print different icons on them depending on the token choice? Like if I want a ZEC one, I'm assuming you'll print the Zcash logo on it? Also, how are you etching them? I also have a CO2 laser cutter, so I'm assuming you're treating them first with a coating, then that's actually making the marking (similar to dealing with anodized aluminum)... Do you have any issues with it scratching off?