I do not think it is okay, your dr gave you an eating plan for a reason, your stomach needs to heal, even if you feel good on the outside, chances are you are still swollen and stitches have not healed on the inside Trying to digest food right now is making your stomach work and they do not want it working.
I have been banded for 12 days and am not allowed to eat mashed potaoes yet. If it falls off a spoon I can have it. shakes, smoothies, yogurt, pudding, Soup.........that is about it. Eat 3-5 oz every 3hrs, get a Protein shake in you, but don't mess with your healing.
You ask if this will be successful in your weightloss.......if you can't follow dr's orders for your post op eating plan how are you going to adjust your eating with your band for life.............because we all know we can eat around the band.
Sorry to be a bit harsh, but I paid $16,000 out of my own pocket for my surgery and there is no way I would risk throwing that money away because I was hungry..........I would just have another Protein rich shake or smoothie
Good luck to you.