I believe it is only possible with:
A) Sol system
B) one of the pre-made NPR home sytems
or
C) the database password.
And C is not really practical due to the number of links between different records (eg Stars, system bodies, populations, ruins, etc). Several years ago I developed a series of scripts to do it, as a precursor to developing something to move entire games between versions as was possible in Starfire Assistant, but it usually required manual correction even when just moving the physical items and debugging the errors could be a royal PITA (remember that Steve is not there to help once you have adapted (ie corrupted) the database). Getting the componentry in ship designs right was too much, so the project got put aside due to conflicting priorities (Small Children (tm)) and now there doesnt seem much point until after the C# version arrives.
