Over the years I have offered my services as a reader for those with disabilities taking exams. It’s very simple work but also very rewarding to assist someone to get a certification (and inform them that they passed).
You’re not actually allowed to have any personal interaction at all, but you can enjoy their reaction all the same.
Recently I have taken up a part-time contracting role as an Online Assessor for a training partner supporting the University of Oxford’s Aritificial Intelligence Programme.