Customer cases detailed layout no option to wrap in a different template

I just realised that there are a lot of module template layouts which cannot have specific page wrapping templates applied to them. They can only use the default template. e.g is the Customer Cases Layout - detail layout. Typically this layout would be in a secure zone which more than likely would require a different wrapping template to be applied. So the only option is to make my default template the one I use in the secure zone so it wraps on those layouts, and then create another template and reassign it to all my other general pages content + sysytem messages etc... hmmm.. so many bits to cover