With all due respects, it seems that your answers are conjecture and probabilities. Non-the-less, I only wish to make the point that, it is obvious that a snake does not need to inject its digestive enzymes into its prey to have successful digestion: whether they are a venomous reptile or not.

I very well realize the complexity of reptilian venoms. I began research thinking that I may use venoms for taxonomic
relationships. No way, because of the reasons that you stated. Variations of venoms due to age, geography, sex and diet made my research impossible.

I was working under Dr. Brattstrom and he assured me that it was impossible with our current technology. That was 20 years ago.