Have you looked at the “Partner with us” option on the MMC website? That may be a good way to start while you educate yourself about other ways you can help.
I don’t think there are that many rabbit specific rescues here in Australia – least that is the case for my state. I think money and education are 2 ways that would really help rescues.
So personal fund raising does not have to be specific bunny related tasks. i.e. You can use your sewing skill to make and sell anything(not just bunnies) but choose to donate your profits toward a rescue. You know, with the current big push toward Bring your Own Bag for shopping that is present at the moment, you could make tote bags to sell.
If you happen to be a well paid professional, you could donate a % of your income toward rabbit rescue. Even a lower wage earner can start by alloting a small weekly amount toward a cause they’re passionate about.
Also, educating the public to the misconceptions about rabbits and responsible ownership can have an impact to. You don’t have to go really big in the beginning to make a difference. Just start orientating your focus to the needs and work from there.