Could split the PC up... I dont know how many games there are, but could play half of them when each team has played each other once in league, then the rest after roun robin. Then finals.
IMO do your draw like cricsim as far as your home and away season is concerned. Have an origin style tri-series for NSW, VIC and QLD at the end of some of the rounds throughout the middle of the season. Could be an idea to have an GB A vs GB 1 vs NZ series as well to make sure everyone has a same amount of games. could hold one at the front of the season and one at the back so they don't have to happen at same time to reduce your simming load in the middle of the season. Then after the club season IMO you should hold international matches at the end of the season
Where we had the Provincial trials this season, I think replace that with the Australian Championship and have a GB Blue vs. GB White and NZ North vs. NZ South game at the same time.
There will actually be a "rest of" exhibition match after the N v S series that breaks more than one of my unwritten laws in CricSim.
In fact, I may do this instead: Australian Championship (NSW, VIC, QLD) Provincial Reserves Comp (GB 'A', NZ 'A', Asia)
Might as well have GB play some extra games against NZ while you do that, given they're the only unattached teams there.
I think you should finish one and then start the other. It's only like it is on CricSim to keep the 'one round per week' thing going.