Hello Andrew (and everyone), I think I have an improvement to your answer (which wasn’t yet possible when you posted)…
(By the way, seems like some of the more recent commenters didn’t notice your simple solution. @MarceloBG and @jonathan_global, did you guys find that Andrews solution had a problem?)
I’m not quite ready to attempt to implement this yet, but I might be needing it, and I really appreciate it!
I think there may now be a solution to your “Side note” limitation (without custom code) now that Webflow supports dynamic CMS data in the Attributes field. We should be able to specify unique “min” and “step” values per product by adding each value in its own field in the CMS and referencing them in the attribute values. Use CMS data in custom attributes | Webflow Features
Hope this helps others. Cheers!
PS: Just want to make sure @mel_bloomcreative saw this, too. No more customer code needed, if I am correct!