[EctoOne]

It was mainly some string replacement to make the links internal.
Then I removed the first two lines of the subfiles to not make them guides anymore.
And then I appended each subfile to the Index.

I included a small script with links to the two additional tools I used.

Edit: Just a note, the script probably won't work with other guides.

And it might actually be possible to delete the first two lines with Rep and LISTs %m attribute instead of using an extra tool. But whatever.

Edit: I was bored and changed the script to only require Rep.