@All_bonesJones
It seriously depends on just what level of simulation you want, but for orbital physics, there are weapon mods for Kerbal space program.
Or, for something actually playable, just remove the speed limit in space engineers, and enjoy your CPU dying :D
@All_bonesJones
Obviously, I have to "warn you". I find neither of these options "fun". God had not created space with entertaining combat mechanics in mind. So, even these "barely realistic" options are way too far when it comes to to something I would recomend to any friend, who wouldn't know what they were actually asking for.
@All_bonesJones
And that's why I actually bothered to respond as well as I could.
I know you actually know what you're asking for ;D
@All_bonesJones
And there are mods for both.