Maybe have travellers sign away their biometric data as part of the visa waiver? Then the EU can claim not to be beholden to the US (the travellers are) and the

Maybe have travellers sign away their biometric data as part of the visa waiver? Then the EU can claim not to be beholden to the US (the travellers are) and the US still gets data of travellers. The demand is for travellers only according the pdf, not for all EU citizens. This does not seem too onerous - people working in the US from EU already have to submit to much fingerprinting, AIDS tests and what not, and you don't hear much complaining about it.