You should just get the impulse cook top last range you’ll ever need, super cleanable, magnetic knobs— is expensive but will be the last one you’ll need: https://www.impulselabs.com/

Why would distribution be illegal if everyone is of legal age? Not saying it’s a good thing to abuse the trust of someone like that— but unless they had you sign an NDA as soon as you send something to someone over the internet you should assume you’ve given up control over it just practically.