There is a way to do it. You will have to create a domain that will allow HTTPS (Vercel is an example) host your MM code on the HTTPS site. On wix create a HTTPS iframe, and embed the site that host your MM code. I did it for a project that was on a Wix site. In this instance, I used Bubble's Web3/MM functionality and embedded it to this site: www.happylittleHairdos.com
Use https://metamask.github.io/metamask-deeplinks/ to deep link your site to auto open the MM app