@Mhy12784 - if added muscle is your goal, then no. While it is true that you will need more protein & calories in order to build muscle, that protein will need to be digested first in order to make it available for synthesis. The majority of digestion takes place in the stomach. The intestines is where the digested food and nutrients is then transferred to the blood stream. If the food is washed out of the stomach before it is completely broken down, it will not be absorbed and will mostly pass through the intestines. This is more likely with bypass patients as it is textbook malabsorption.
If you truly need more protein and calories in a fast absorbing form, look for a hydrolized protein.
To the OP, it is exactly like you stated, a slippery slope. Eventually you can form the habit to drink while eating which will wash the food out of you stomach and you will get hungry sooner. I am almost 3 years out and the only modification I have made to the 30/30 rule originally given to me is that I will drink up until I start eating. After I start, I do not take another drink until 30 minutes after my last bite. I find that while I may at first be dying for a drink, after a few minutes, that desire fades. Only time that is it difficult is when I am eating something that is spicy (e.g. homemade habanero jelly).