This sounds like a problem you will face many times in the future and therefore you may benefit from finding a solution that will solve for both this request and all similar future requests. For example, instead of writing any customised response, you could write a blog post / make a webpage that explains your approach to these types of request and then simply link to it in a reply. Then every time this comes up you can simply paste in “Thank you for your request. Please see [URL]”.

I find doing this type of thing (creating nice canned responses, creating reusable answers) nearly always pays off in the medium and long term and find that it’s much easier to put the effort into a response knowing that you’ll get long lived value from it vs it just being useful for one person.

Similarly, I often find others have done similar and if their thoughts align with mine I don’t need to write the answer myself but instead can refer to someone else’s blog post etc.