ML teams at hosting platforms like Wix or Shopify or Squarespace could offer the same as a built in or slight higher tiered premium feature, paying a tiny fixed cost instead of a share of revenue uplift.
This could even be basically an intern or a new grad project at tech companies like that, the technology for the model is very simple. The devil would be in the details of integrating with the data model backing those platforms ecommerce shop products, but you could solve once and then immediately offer it for all your customers and out of the box for new customers.
The part of your idea that makes me skeptical is the scalability of applying your recommendation approach to bespoke customers. Like, I’m sure you can do it, but with nowhere near the same reach or efficiency or price point as well capitalized major store hosting platforms.