Guys, why you neeed to hide BIP38 key? Or even trust me to destroy those keys?
You'll give me ONLY encrypted key and only you will know pass-phrase.
I propose to all backer on Kickstarter to use this site:
https://walletgenerator.net and generate there BIP38 protected keys. And for sure don't tell me that pass phrase.
The only thing you need to trust me is that I'll make engravings on metal cards

But that will be a really bad idea to bury a successful kickstarter account for extra several hundreds dollars.