Hmmm... I think it possible in one way...
Maybe it can work in the same scenario like Coderus Aegis-install hack, where the installer creating local repo and install package from this repo...
I tried to play with his package, tried to learn the structure etc... Started to create the offline installer but I stuck in some level... I'm not programmer and my knowledge is not enough to do this... But I think it should work in this way...