It's styled terribly, but I just added a sidebar of micro.blog posts to my main blog. Moved to 11ty at the beginning of the year but had not yet figured out a way to deal with title-less short posts. As a result, I wasn't writing any. I think my under-the-hood stuff is going to work; keeping the two types of posts in two separate lists, on the site, but mergeing them together into a single RSS feed that micro.blog can interpret correctly.
Alas, I have to test it to see what breaks (I'm mostly curious if title-less posts are going to show up correctly in m-b.). So this is the test.
(Also sorry for whatever this might do to your feed-reader. Really hope I'm not about to re-publishing 100s of posts... ☹️)