How are you doing? It took me a week or so to make scalding part of the "normal routine".
The milk is ok for your baby to drink if they take it.
I never scalded my milk in a storage bag so I can't speak to whether the bag itself can withstand it. If you are uncomfortable about it, don't do it. I'd scald in the pump bottle (medela) and then transfer to bag for storage or bottle for feeding (I used a different style of bottle for feeding vs. pumping). I never had any issues with this. If you are uncomfortable with the plastic, you could always transfer to a glass container for acalding only and then back to bag or bottle for storage or feeding.
I threw away all my previously frozen milk then I learned later that probably a milk bank could've taken it and used it.
I know this is a lot to take in all at once and there are many pages to this thread but what we all have learned is that scalding won't fix milk that had already had the effects of lipase breaking down the fats. It will only prevent the fresh milk from being affected.
I suspect there has not been more reasearch on this because research requires funding. In general while there are amazing benefits to breastmilk there are many areas of its wonder that could be researched more. Since the composition of each mom's milk is unique and since those with lipase issues are in the minority, those are probably other reasons why there is so little available on the topic.
Good luck and all the best.