Agreed - a fingertip works equally well.
The van ignition key is also a useful substitute.

It isn't when driving a Merc van. Tried it but as they don't have a traditional key, and don't have a pointy bit they don't work very well. Our tags with the registration number on them have a pointy end that work! Several of our touch screens don't work, so I opt for the old fashioned paper and pen instead in those cases!