Not a Brave user but I have managed it at a workplace before. Far as I recall they show a wallet button at the top right near the extensions button and show crypto trading rates alongside the weather on the default new tab page. Disabling the wallet icon could be done with a right click and a left click, and the new tab page could be customized in settings to show less stuff pretty easily. Might be different now.
#2 opt-in only.
#3 agreed. annoying. can opt out.
#4 opt-in only.
#5 disagreed.