Cold Dming influencer to be a co founder

Hey Everyone! I am currently on the fence about reaching out to an influencer in the industry my startup is in and I was wondering if it would be a good idea to bring on an influencer in the space as a marketing co founder, after receiving some sort of validation of course. The idea is to tap into their already large audience to grow awareness of the product, as well as since they already do the kind of videos I want to do and have experience in it. I thought about sponsorship but budget is abit tight for their kind of audience. Would this be a right move? Has anyone seen this work? If so does anyone know any good resources on cold outreach through dms? Thank you!