[kevinjohngallagher]

Hi GGwarpig,

It is possible with my “themer” plugin, which has an option to dynamically load a different header/footer file or just a different stylesheet depending on the domain you’re looking at. While this doesn’t load in an entirely different theme, it incorporates most of the changes you’re looking for.

Sadly it can’t be released until we get an answer to this (what appears to be) bug in the core: https://bbpress.org/forums/topic/overwriting-template-functions