I ended up just working on it offline, then sending a copy to Robin Lee, N Gauthier, and the US Presidents Project in private messages, so everyone has it for whoever gets to it first. Feel free to just copy/paste into the bio from there when you get it- I'm heading to bed and am not sure when I'll be back on WikiTree tomorrow. And of course, make whatever edits you feel are necessary and check for typos!
Edit: it looks like ref tags get removed from private messages, so you'll need to either add them back in yourself in the biography edit box or add me to the Trusted List and I'll do it.