How klik works: First, it determines (using serverside-apt) what packages must be downloaded. Then it downloads and unpacks the deb files to a directory. Then, it patches all binaries to use relative rather than absolute paths for /usr. Also, it creates links from the AppDir to the "real" files, if needed. Finally, it creates a wrapper that sets the paths as required and then runs the app.

In principle, you should be able to "install" all packages that way, at least all that are in debian, by using klik://replacethisbythenameofanyapplication - but some packages need "hand-tuning" after installation....

Greetings,
probono