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.

I would recommend running untrusted proprietary software as a webapp if possible, it will not be able to be as intrusive in that case compared to native app even with all the sandboxing (flatpak, snap, etc…). Or Virtual machine as the most secure option, but it may be overkill.