Would you do this?

Please don’t JUDGE! This isn’t a debate about the Covid Vaccine, but more about the benefits that the antibodies have through Breastmilk. I am currently nursing a 7 month old, and was ready to stop the journey. I have my shot scheduled for next week. I also have a 5 yr old. I was thinking about pumping some extra milk after the feeds for my LO and hiding the BM in my 5yr milk in the evening to give him the antibodies as well... is that weird? When I say “hiding” is because I am not sure if he will like the taste..