There are several issues with how things work in any of these scenarios:
1) You can't have the Force in a conference based in RSA. Its still an 11 hour flight to Joburg without connections to the other places, which is grossly unfair compared to the eastern states (and I include NZ in that).
2) Making the Asian or Argentine teams travel is also fucked, though that could be mitigated from their POV by having their home games consecutively.
3) A three-pool approach with a 6th South African team, and an Asian team in either NZ or OZ conference, still leaves the question of Argentina and their time zone issues - they end up with the longest commute regardless.
4) In any of the above three, you have teams making a one-stop flight to another time zone which can't suit everyone. But it probably has to be done to accommodate Argentina.
The European setup seems to work for them - as others from up there have stated: there is the hatred for neighbours and excitement for strangers that fuels the fire.
But three static pools doesn't always work either, and doesn't create any competition between organisations to improve (just sign better players/coaches) so we need to have a qualification process available where possible for teams to aim at.
In the first few years it will probably be the Super franchises as the main competitors, but over time I'd like to see as system where each nation runs their domestic competitions at the back half of the year, and qualifies teams out of that for a three month (ish), play-everybody-once championship like Super 12 used to be.
e.g. In New Zealand, the semifinalists from the ITM Cup Premiership qualify, and the winners of the Championship join them. Same with Currie Cup.
In Australia we have the four semifinalists from NRC - which may grow into a similar system as the above as the NRC expands. In Argentina and Japan, they bring their club champions to the competition each year.
Qualifying teams get a financial incentive for stepping up to the next level, and have the off-season to prepare their squads for the Super level of competition.
Over time, more teams from Japan, Argentina, and the Islands can be added, as the financial benefits start to flow down.
Eventually, each nation should be running an 8-10 team domestic competition that will run two rounds during winter, with defined breaks for these top tier games to play smaller pools for championship games, just like Europe e.g. HEC running alongside English/Celtic/French leagues.