I just discovered something. The maintenance tool does show Qt 5.2.1 via the package manager, just not when you click "scan for updates".
So it is possible to install 5.2.1 right next to 5.2.0. You just use the Maintenance Tool package manager radio button to install Qt and then you don't need to install another copy of QtCreator. I think newer versions of Qt should show up when you check for updates too, but at least I can get things to work now.
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