Go ahead and give it a go!! the worst that can happen is you don't like it and shave your head and wait for your natural hair to grow back in. This way you will learn if hair replacement is a viable option and if not you can move on with another plan of action.

All of the above posters make very valid points and I agree that you have quite a bit of natural hair left but you seem to have put a lot of thought into this decision and I believe it will benefit you moving forward regardless of the outcome.