An alternative could be to expand the RC into two 8 team divisions to start. Each division split into two pools. Each pool plays each of its in pool competitors home and away for 6 games and then a game against each of the teams from the opposing pool for 10 games. The first part runs through the soon to be July window and the second in the current RC window.
The first division would look something like the current 4 RC nations plus Japan, Fiji, USA and Georgia. While the 2nd div would feature Samoa, Tonga, Uruguay, Spain, Russia, Romania, Canada and Brazil. Just as with the RC at present team with the most points at the end wins but with relegation imposed on the bottom team to be replaced by the winner of the 2nd Div.
From there make a deal with the 6N's Unions on an alternating touring schedule in the November window. As in one year the ABs and Arg go north and play three games each and 2/3 head south.
One thing I think we all need to remember is the KISS principal.
I don’t think having European countries involved in a (and I don’t mean this in the wrong way) Frankenstein like competition, where half the countries play in a competition against teams 20hrs away while there is a European based competition already been played (6 nations), that people will always see as the superior competition in the area, is the ideal situation.
Competitions need prestige, let’s say in 30yrs Georgia were to win this competition, they would essentially be the champions of the ‘rest of the world’ but not the champions of the tournament that means the most in their region. It’s just all a little soulless, it’s kinda how and where Super Rugby has ended up.
I think there is almost more value in a Pacific competition, with a return to NZ, SA, Aus and Arg returning to 3 game tours of each other.
As an example a Pacific 5 Nations
Aus v Fiji
Tonga v Aus
Aus v NZ
Samoa v Aus
2nd Bledisloe - NZ v Aus
SA tour of Aus
Aus v SA - Bris
Aus v SA - Syd
Aus v SA - Per
Not saying I think this would be the ideal scenario either, but it’s at least simple and engaging to the people in the same area