I have an aftermarket cage, and when I added new suspension seats, they were pressed up tight against the crossbar, so moving mine back would not be an option. This is something that you would have to allow for if you got a new cage. The cross bar (used for mounting harnesses), would have to curve backwards a bit to allow for extra room for the seats. I'm sure it could be done.
BTW, recover from the party OK?
I could show you, but then I would have to kill you.
The line must be drawn here! This far, no further! And I will make them pay for what they've done!
"Space is disease and danger wrapped in darkness and silence"