bootstrap op amp
I can hardly believe, that bootstrapping (although the term is rather vague and may designate different concepts) will help you to design a low noise amplifier.
Very simple, to increase the input impedance, use a higher impedance amplifier, or a different circuit. Unfortunately, neither the imagined circuit nor the source properties, particularly it's impedance have been clearly said in your previous posts. I think, it's time to disclose some information now.