Nations cup is only for a small part of the community and not having a 6s season for almost 6 months is way too much. I dont even know how you did end up with this idea.
The best solution is to get the 6s nation cup running at the same time than the highlander season. Only a small part of players are playing the nation cup and an even smaller part are playing both. This way you dont have more than 50% of the etf2l community not playing for 6 months or only playing some cups.
Made you guys a provisional schedule
Highlander Season 22
Signups: 31st July – 26th August
Premiership Qualifiers: 21st August – 30th August
Final divisions: 29th August
Main Season: 30th August – 2nd October
Playoffs: 4th October – 23rd October
6v6 Nations Cup #8
Captain Application: 7th August – 4th September (Or 21th August)
Final Groups: 5th September (Or 22th August)
Group Stage: 6th September – 27th September
Playoffs: 27th September – 16th October
6v6 Season 37
Signups: 25th September – 16th October
Premiership Qualifiers: 11th October – 16th October
Final divisions: 17th October
Main Season: 18th October – 4th December
Playoffs: 6th December – 18th December