Female led relationships discussion

I’m seeking some guidance on how to handle this situation with my wife. I really want to have a spanking that leaves my backside bruised and tender. My wife isn’t entirely keen on the idea, though. She enjoys keeping me in chastity and teasing me but has never been particularly interested in ‘punishment’. There is a woman nearby who gives spankings, and judging by her website reviews she seems very professional and skilled with various tools. My question is how should I suggest that my wife send me to this other woman for punishment? There are no sexual services involved and I have no wish to receive any. I want to go there, get spanked, and return home to my wife with a painful rear! What do you think about this? Is it considered cheating? How many wives would agree to this?