I don't see the point since there are few charity which accept Bitcoin (which already mentioned above), unless you're trying to promote this forum.
But since you mention to show Bitcoin community to the world instead of bitcointalk.org community, how about you start the charity movement?
My unpopular opinion:
If you are planning to help, just help in silence. This is not really the time to be thinking about promoting Bitcoin and and other cryptocurrencies through donations. I can't imagine to see a donation with "Donation from Bitcointalk community" label on it. The move is just the same with politicians taking advantage of the situation by having their faces and their names placed on the relief goods/items they give to their constituents.
Or donate it anonymously without represented specific group (e.g. this forum), just like what Pineapple Fund did.