There is a problem with your statement.I am in agreement with the statement above but I believe there is a necessity to add that Christ was under the bondage of sin and death because he was taking our sin on himself and dying in our stead. It doesn't make the theory wrong or damage it in any way but it is the result of further study of scripture. Early church fathers seemed to be on track to go in that direction judging from some of the things they said. In addition there is no means of reconciling spelled out in your theory. In fact, that brings up a very important point. Why is there a need of "reconciliation" at all. It is because of man's sin and nothing explains it like PSA. The solidarity needed is provided by the fact that Christ was fully man and thus could completely identify with us and act as our head as the second Adam. There are all kinds of prophesies fulfilled by the fact that Jesus died on a cross and I also have no problem agreeing with the symbolism of Rome above.
I'm not sure I agree with that but I don't wish to go there at this time.
You posted " I believe there is a necessity to add that Christ was under the bondage of sin and death because he was taking our sin on himself and dying in our stead", but at the same time you acknowledge that you do not believe Jesus died (physically) instead of us (you seem to, at least, acknowledge that we still die physically).
This means that whatever it is you believe Jesus suffered instead of us, it was not physical death.
I understand that you believe His death necessary. But your posts indicate not technically necessary in a penal substitution manner. Instead you shift to satisfaction. But even here you are unable to explain why Jesus had to die (except God demanded it).
As far as Genesis 2:7-8 and 3:22-23 goes, you misworded your reply. You did not, per your confession, know that Adam was created then put in the Garden, or that Adam was returned from whence he came. Now you at least know that Scripture says this is what occurred. You should have said that you have not decided if you will accept those passages yet, as you have not considered exactly what impact that would have on your theory. It has a severe effect, BTW.
I am surprised you have not abandoned the discussion before now. There are many things you need to consider. That is never fun.