I was able to get the points I needed. Thanks to those who offered. And of course, then I couldn't get the number of tickets I wanted on the day I wanted, because of mystery errors on the web site, so that's neat.
To transfer points:
(this is on the regular browser version of the site--haven't tried it on the mobile site)
on the main page, click the arrow in the black bar with your name on it
click Points Management on the right
scroll down to "Transfer to Non-Partner"