I think it is low risk also.
I would knock with my foot if the person wasn’t at the door waiting. Everyone with masks on.
I’d bring along hand sanitizer.
I would probably only bother with kids aged 5–10. Kids who actually know what is going on and who remember and would miss trick or treating.
I would just let the candy sit for 3–4 days like I do all my pantry items, I don’t wipe them down. Enough added chemicals going on right now. I do wipe down packaged frozen and refrigerator foods. Fresh produce I rinse off well, and I don’t usually eat it for a day unless I am cooking it, then I don’t worry.