Found the solution myself: just transferred the href code to the option text instead of the label. Problem solved.
I guess explicitly agreeing to the privacy statement as well is more strong from a legal point of view.
I’ve managed to add a required radiobutton checkbox to the checkout and I’m happy with the result: https://nimb.ws/FVuWET
Did it with these settings in the checkout field editor: https://nimb.ws/gIc6xV
Only thing bothering me still is this ‘ugly’ warning I get when people didn’t check the radio button before they wanted to place the order: https://nimb.ws/RWjHGA Is there a way to go around that?
