Hello!
I tried this mod and started fresh, without doing the other planets. I had the basic Nauvis technology researched, but otherwise, bootstrapped everything from Rubia. This also means i have no space platform. I managed to get to the rocket and launch an initial platform, but now i am stuck:
I cant research iron man since there is no way for me to move the science somewhere else. I can build the platform and thrusters, but i cant build asteroid grabbers or crushers.
Looking at the crafting tree, the only thing i am missing is low density structure. Which in turn needs plastics. I have seen that there is a tech which allows low density structures after iron man, but i cant research that.

So either we would need a way to get plastics or LDS early, or a way to get black and blue science on the planet.

First, congrats on beating Rubia.

Rubia is currently not compatible with an any planet start. I did not implement it because it would have taken a very long time to fully design in a way that aligns with Rubia’s design philosophy. Specifically, a proper AnyPlanetStart would include 1) ways to get all the other sciences in a way that let you get all the techs you skipped, 2) tech tree redesign to work with getting all these techs as you go along, 3) a way to leave Rubia properly. As this is a large undertaking, I still do not have plans to add AnyPlanetStart compatibility.

I understand that you find yourself in a precarious position, but I simply do not have plans to design a whole separate crafting chain and tech tree to support it. I recommend you use whichever cheats/mod you used to get your save file into this position to also get the missing parts you need to continue your playthrough. Be advised that you will quickly run into the reasons why I do not support it.