I am actually working on the exact same wizard setup as you described above, as "a single page and the visible part controlled with Ajax and if-blocks." Do you still have this sample app/espace I can take a look at?
Thanks a bunch!
The attached sample SumWizard requires LiverpoolTemplate etc. but you probably get the idea even without deploying and just by looking at the implementation of MainFlow/HomePage.
Hope this helps!