Can't any debian dev see his stupidity regarding to this issue? There are tons of qt4 apps that are widely used and will be probably never ported to qt5, like Skype for example, but many others too.
You decided to drop support for them just like that (90% actually used linux apps) and you are providing the only solution "Port your app to qt5". All workarounds decrived here look like a joke, not real solution. Ubuntu provided this patch, Arch provided too. Every known distro has workaround built in by patching qt to make their users live easier. But not Debian. Shame and f.... you (sorry!).
