Apply ConfiForms template to an old page

[Anna]

Hello there!

What we've got:

- a page with ConfiForms macros created according to the documentation

- the ConfiForms page contains all the created pages in a list

- a previously created page, it's based on another template

What we need to apply the ConfiForms template to that previously created page so that:

- the previously created page is modified according to the ConfiForms template

- the previously created page is added as an entry to the list  of ConfiForm template 

Question. We don't want to recreate the page via ConfiForms template since it's not one single case. Is there a relatively simple way to apply the template to an old page?