There will be no situation in which a mugger could get something from you
Don't have your card/phone on you? No worries! We can still force your hand to withdraw money
Don't have your card/phone on you? No worries! We can still force your hand to withdraw money
If it's just that they hold a gun to your head and make you authenticate with your palm, then they can do that right now. Once the gun is to the head you're kinda compelled to do what they're saying regardless of whether you authenticate with biometrics, password, whatever.
…does that not seem incredibly convoluted? And not even that damaging for you, it’s obviously and clearly fraudulent, you’d have no issue getting the chargeback.