If the venue you are using has a grand piano, hopefully, tuned recently, I would be pleased to use that. If not, then I would be just a pleased to use a keyboard that would come as close as possible to a real piano which may be begged or borrowed on my behalf. I can recommend one or two if needed. The best have “Digital Piano” or similar in the name. I would need to sit at either of those, on a pneumatically adjustable drum stool. If a grand piano is used, my recommendation is that the lid is fully open toward the audience and for micing, a single SM57 mic on a tight, steady boom stand which I’ll help place at sound check. That, plus vocal mics [SM58s are best for live sound] and floor monitors for Nancy and I. That should be all we will need. I know way more words than equipment items.