I think going from stage 3 foods straight to big chunks of meat is pretty unrealistic.
We do a lot of yogurt and soups, anyway - she tries to make them into finger foods, but it's pretty gross.
What I would do is to give either chunks that are very soft, like large chunks of banana, avocado, or cooked veggies; or else small pieces of harder foods (like meat, raw apple, raw veggie)so he's dealing with size or texture, not both at the same time.
I don't know why you "have" to suddenly eliminate bottles??? We bf, and just this week went from 3 meals and 4 bf per day to 3 meals, 1 snack, and 3bf per day. She also gets a sippy of milk with her solid meals. I plan to keep at least the morning and bedtime bf as long as it still works for us.
Anyway, you can do sippy with meals and still use bottles in the AM and PM if you want. Sometimes after reading things on here, I'm really glad I live in the US and don't have to deal with HV's