Compile and install KIO with D23490 and D23780 applied.
(If Krusader is installed, change `krarc` to `sevenz` in the URL bar if necessary.)
Test using Dolphin:
Enable "Open archives as folder" in Dolphin, then open and browse a 7z archive using the `sevenz` protocol.
Test using Gwenview:
View a 7z archive containing photos. Browse and view images inside the archive.