A straightforward partnership with the cc as one partner and the other two people as partners all to the percentages agreed, an agreement saying who owns what, who does what and what gets done by the cc as far as admin goes.
Obviously you will have to run a separate set of books,
The only downside I forsee is that you are jointly and severally liable for debts in the new partnership so if it goes belly up and the others have no realizable assets the creditors will come after the whole cc.

I would definitely compartmentalize the new business with it's own pty ltd even if you only use it to hold your shares in the partnership.