Insert plain commands into the document with an Inset

[ehud.behar at protonmail.com]

How can I create an Inset that once inserted into the document, adds the following commands to the document?:

\mainmatter
\pagestyle{fancy} % new page style
\newgeometry{ new page layout goes here }

Of course, I can insert these commands with ERT, but I prefer them to be defined a more GUI friendly object.

If I create a new flex inset, it either adds an environment (\begin{LatexName }...\end{LatexName ) or a command (\LatexName{...}). I don't need any text (ERT or anything else) to be inserted into this inset. Just to insert those commands into the document.

The List Of Figures insertion, for example, does something similar, but it has some information such as Placement and Extension that are irrelevant in my case.
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