Sorry, but I can't make sense of your Replies #28 and #29 (or #25 as I already said). You have ideas in your head but you are only giving us the high-lights without providing the background info that would enable us (me, anyway) to understand what you are thinking.
For example it is ridiculous to think of powering a 4.5v to 6v servo with 3.3v - so that is probably not what you meant.
...R