Here's a go, although mine takes bloody forever
Also used Cook Islands thanks to their good PC run, and Lebanon over russia, but obviously a qualification should take place for it.
Super Group 1: England, France, PNG
Super Group 2: Australia, New Zealand, Wales
Minor Group 1: Scotland, Samoa, Cook Islands, USA
Minor Group 2: Fiji, Ireland, Tonga, Lebanon
(Aimed for a bit of a NH/SH split). (Examples later on in brackets)
Week One: (Grand Opener/Wembley Double Header?):
England vs France
Australia vs New Zealand
Week 2:
England vs PNG, Australia vs Wales, Scotland vs Samoa, Fiji vs Ireland, USA vs Cook Islands, Tonga vs Lebanon
Week 3:
France vs PNG, New Zealand vs Wales, Scotland vs USA, Samoa vs Cook Islands, Fiji vs Tonga, Ireland vs Lebanon
Week 4:
Scotland vs Cook Islands, Samoa vs USA, Fiji vs Lebanon, Ireland vs Tonga
Q1: 1st Place Super Group 1 vs 2nd Place Super Group 2 (ENG vs NZ)
Q2: 1st Place Super Group 2 vs 2nd Place Super Group 1 (AUS vs FRA)
3rd Place in each SG get the week off. (WLS&PNG)
Week 5:
Q3: 3rd Place Super Group One vs 3rd Place Minor Group One (PNG vs CKI)
Q4: 3rd Place Super Group Two vs 3rd Place Minor Group Two (WLS vs TNG)
Q5: 1st Place Minor Group One vs 2nd Place Minor Group Two (SCO vs IRE)
Q6: 1st Place Minor Group One vs 2nd Place Minor Group Two (FIJ vs SAM)
13th Final: 4th Place Minor Group One vs 4th Place Minor Group Two (USA vs LEB)
All teams from Q1 and Q2 have the week off.
Week 6:
QF1: Winner Q1 vs Winner Q5 (ENG vs SCO)
QF2: Winner Q2 vs Winner Q6 (AUS vs FIJ)
QF3: Loser Q1 vs Winner Q3 (NZ vs PNG)
QF4: Loser Q2 vs Winner Q4 (FRA vs WLS)
LF1: Loser Q3 vs Loser Q5 (CKI vs IRE)
LF2: Loser Q4 vs Loser Q6 (TNG vs SAM)
Week 7:
SF1: Winner QF1 vs Winner QF4 (ENG vs FRA)
SF2: Winner QF2 vs Winner QF3 (AUS vs NZ)
LF3: Loser QF1 vs Loser QF4 (SCO vs WLS)
LF4: Loser QF2 vs Loser QF3 (FIJ vs PNG)
9th Final: Winner LF1 vs Winner LF2 (IRE vs SAM)
11th Final: Loser LF1 vs Loser LF2 (CKI vs TNG)
Week 8:
WCGF: Winner SF1 vs Winner SF2 (ENG vs AUS)
3rd Final: Loser SF1 vs Loser SF2 (NZ vs FRA)
5th Final: Winner LF3 vs Winner LF4 (WLS vs PNG)
7th Final: Loser LF3 vs Loser LF 4 (SCO vs FIJ)
Eight Weeks, 41 matches, fairly evenly matched. Or we could grow a pair, add someone like jamaca/russia and have a 16 team comp. But that would be too easy to explain to new randomly interested fans, wouldn't it