What problem are you trying to solve? There's only two reasons you'd want this, either you're trying to hide money as you enter a country, or you're holding bitcoin and want to pump up the price.

Bitcoin machines are a huge 'business'. And most people on the airport don't need them, they already hid their valuables. But I have stories to tell about those machines - one thing is sure out of 10 customers 9 is a scam: usually older lady with their life savings in yheir purse and they will be on the phone. They will insist the one on the call is their son - although they are using heavily accented English and call them Ma'am.
The tenth one is a couple of people speaking in a Slavic language.

There likely would be some demand, but the premise in that case is to bypass 10000$ threshold of cash that you can avoid declaring. I do not think airports would be interested in facilitating that, and even if they do install the machines would be heavily KYCd with your ID and all, which kind of defeats that purpose, because you can bring over 10k cash no problem, but you have to declare it.