Quite some tall tales, mister. There were female “Space Marines” (then called warriors) in the first batch of Rogue Trader minis, like these lovely ladies here: 
So I really doubt they needed you as an inspiration for Sororitas. Also tournaments in 2nd edition were a joke with Vortex missiles and grenades and all the other totally whack stuff. It was fun to play with friends. Fair, or balanced, it was not. And if GW had gone on to cater to people who make armies from 12 cheap models they would have gone bankrupt a long time ago.
What you probably need is something like Five Parsecs From Home, Starport Scum or Planet 28. I’ll throw you some links to free stuff:
https://www.wargamevault.com/product/231076/Five-Parsecs–Salvage-Crew
This Pay What You Want, a solo game set in the Five Parsecs From Home rules/universe.
Pay What You Want, Planet 28 rulebook.
https://www.wargamevault.com/product/311013/Death-on-the-periphery–Solo-rules-for-Planet-28
PWYW Solo expansion for Planet 28
Also remember, all the rules and stuff for Rogue Trader and 2nd edition are still around and you can play them all day long.
