When it comes to the about page, the strategy you’re describing should work. Sometimes deleted pages hang around for a while but forcing a rebuild of your site should get rid of them for good.
Photos and replies are list pages and a bit more involved. In theory, you can have listings with localized slugs if you’re comfortable with setting up a Custom theme. In practice, it could have consequences depending on if Micro.blog makes assumptions about URLs to these pages somewhere. What do you say, @manton?