I like the sentiment but just want to point out something about how GST works. GST is a consumer tax, so for this:

After they are popped they do since they have been heated, so the customer bears the GST cost but the cinema buys the “raw” ingredient tax free.

The cinima is already buying popcorn GST free. Only the end consumer pays GST.

A better example might be a cafe that sells raw apples or bananas, but everything else is “processed” so they would have to do a software update for the sake of one item in the store that not that many people buy.