Dig through you stash of pens. I bet one or more has a rubbery soft tip stylus tip on one end. They are designed to work with tablets or phones. I car one in my car anymore. Most machines don't need a full signature, just poke the credit or debit button. But if you have to sign the pen is easy. Just does it with alcohol when you are home. Vodka or gin will likely work as well.
