Mars L1 Lagrange point is only 2.2million km
This is false. https://www.wolframalpha.com/input?i=Lagrangian+points+of+mars L1 is 137Million Miles from the sun. Though it is only 650,000 miles from Mars, which is probably where you are getting your 2.2million Km from.
The idea of “posthuman cyborgs” is so fanciful, that I don’t think you are connected enough to reality to even make an accurate judgement on “the possible.”
We have the technology TODAY, RIGHT NOW to go to mars and make it back. There is no over-arching reason to do such a thing, but there are also no significant technological barriers preventing us from doing it. Human Cyborgs are 100% impossible today, and there are a myriad number of things preventing that kind of development. For example, we cannot today, keep a brain alive for any significant time, outside of it’s existing organic support body. Individual neurons? Sure, but a system of neurons at any comparable complexity as even a simple mouse brain? Nope. On the other-hand we have actually kept people alive in space for over a year, and we only need around 2years to get to mars and back. We also have the capability to send things to mars and bring them back, so combining those two things, and there ya go.