How can I realistically use pantropy in a hard science fiction setting?

[Rynn]

Mind uploading does exist, problem is it just that culture has prevented its large scale use. That and ethical issues. >

Don't be so quick to discard ethical issues, IMO there's huge potential for SF to properly explore the real ethical issues of various technologies (beyond the usual overly simplistic luddites/religion vs "progress").

Do you have any comment on the answer I have with regards to how pantropy can be used?

You do not mind if I link a Google Docs to the project I based this universe on, do you? If not...well, here it is: To The Planets Beyond (Original Edition) . The timeline also goes as far as 2500 in the Extended Edition, but that has not been completely developed. Oh and some additional links to help would be nice: The Extraplanetary Wars, Realistically Conducting a Combat Manoeuvre (Part I), and finally Realistically Conducting a Combat Manoeuvre (Part II with Available Tactical Options)

So, overall: think of this as a dumbed down version of Orion's Arm's Interplanetary Era mixed in with The Expanse (in terms of some elements) and GURPS: Transhuman Space (the latter of which I proudly own).

Ok, skimming through those I think I have a sense of your setting now. It would still be useful to know specifics of technology, economics and culture surrounding pantropy itself to properly help you get an answer.