SNIPPET: Add an “Upgrade” Button To Item on Checkout in WooCommerce – Select Upgrade Product Per Product

This is JUST a proof of concept.  The code here is no where near ok for production.  I share as a snippet, use if/how you can.

https://gist.github.com/ChrisFlannagan/d7559c3682bc3db588cd9c6b70c01dec

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