Update: Jan 4
I realize it is possible to change my Facebook privacy settings so that only Friends see the organizations supported by on-platform donation processing. I generally don't use social sites this way. Postings are public, and private communications are by email, or by FB message, Twitter message or normal iPhone text (or call).
Again, I need to get a human being at FB in chat or by phone to discuss these problems. I will attempt to do so by the end of this month.
I also understand that by doing donations through a trust and bank mechanism, that non-profits miss out on matching donations, and so this could be a sensitive matter for them if it were a widespread practice (from estates). But we don't want platforms to put the integrity of political speech at risk by implied demands for support for their causes, however compelling.
Update Jan 5.
They even put this on my Page, too, after a post on declaring a national emergency.