This sounds like a desirable group of features, but might this tread a bit too closely to making Brave a money-transmission service and put them under the scrutiny of far more complex regulations?
The situation is more analogous to patreon: a centralized service which you make bulk payments to, and they divvy the payment to your selected set of people who are not employees of patreon.
Brave is starting a centralized service where you make bulk payments to them, and they divvy up the payment to your selected set of sites who are not employed by brave
I think the situation you describe is how brave has worked for many years now. Just fund your wallet and enable auto-contribute and it'll happen. Whether that's legal or not, I dunno.
My point is that however legal it is is unchanged if you give users more control over how much goes where and let them curate such settings for each other.
If it can be made clear that you're paying for content you're consuming, that might waive it to an extent? Who knows.