Price calculator with 'ADD TO CART' button?

Building price calculators for quotes into Wix looks like it’s been done a lot and there are easy to use widgets such as Calconic - but has anyone yet found a product or a method that includes the all important Add To Cart button?

Here’s a screenshot of what I’ve come up with in Calconic to illustrate the sort of thing I’m trying to achieve on my product pages:

And here’s a Wix website with a great example of a similar thing. I found the link in a Velo thread which I’ve now lost.

Platforms such as Shopify seem to offer greater compatibility with such integration, but I want to stay with Wix on this project.

Any help much appreciated!