[avmich]

Soviet Union used to deploy R-9 - a rocket which was "always ready", launching within 20 minutes from the command, while using liquid oxygen and kerosene as propellants.

https://en.wikipedia.org/wiki/R-9_Desna

So, it might be considered, I guess. Even though Starship looks rather from another era...

[scrumbledober]

Kerosene makes a lot more sense than methane. The only reason methane makes sense for SpaceX is they intend on manufacturing fuel on mars for the return trip.