I reckon you're underestimating both how much funding is directed directly and indirectly from pros to development officers at state union level, and also the impact those guys have on a rugby community
I honestly reckon the best course of action is a 10 team quasi-domestic comp. Quite literally NRC but with KNOWN brands and more pacifika.
Samoa, Tonga, Fiji + the 5 Super Rugby sides, a 2nd Brisbane & a 2nd Sydney team. Tahs never resonated with anyone west of Anzaac parade, so call the 2nd team Western Sydney. Call the 2nd QLD team Southside.
Accept that we're going to lose a plethora of professional players. We're already losing them; once the broadcast deal for whatever iteration of Super Rugby takes hold - we'll be losing even more due to its pathetic ratings. Set the maximum wage at $120k. That means we'd be spending $20mil a year in player salaries, money I daresay can be found with ease.
Take a leaf out of Mindaroo's book and make every professional player contracted to one of the 7 teams spend a MINIMUM 8 hours a week doing "community service". And by community service it's really professional development. They're going to be better players & people by being better coaches. I'd mooted precisely what they're doing over in WA at the beginning of this 600+page thread so I'm going to unrealistically take credit for this.
After the first year a player should have his level 1 & 2 coaching certificate. 2nd year they should be a fully qualified coach.
2 afternoons a week running school competitions in non-traditional areas - 1 for training 1 for playing.
1 evening a week coaching a kids club team. Saturday morning watching them play if they're not playing.
Every kid they coach gets a free ticket to every game, just like I did for the bleachers at Ballymore when I was a wee tot playing club rugby.
Poof, we magically have an 18 week competition, 2 or 3 weeks of finals and enough room in the calendar for any variation of Super Rugby as a cup format.
What's best is it's built from the ground up, rather than the top down.
A team of 30 can literally advertise this weeks game to two sets of 15+ kids a piece; every week. Simple math literally means that they're encouraging/getting 900 kids at the game; along with however many paying adults that are dragged along with them.