If AOPA is offered and accepts a grant, then its usefulness to GA is finished for good because it can't then criticize Government policy.
With respect, your idea will do nothing but produce a big shiny report written by the incumbent and a whining request for a new grant before the first one expires.
The Government uses this form of "industry assistance" a lot. The government cannot be criticised in parliament for wasting money because the only deliverable is a report and AOPA has to shut up for foreseeable future about how the Government is mistreating GA. The technical term for this is 'buying silence".
Better idea - change the Act to require fostering Aviation then establishing an office within CASA / DOT to implement that.