How to create different types of changebars

Question

I need to mark two different types of changes in a document, but I cannot use different colours. The only solution I found so far is to change the \changebarwidth, but using a thin and a thick changebar, respectively, is not a 'beautiful' solution for my needs. Instead, I am looking for a solution to change the type of the changebar, e.g. using a "double-changebar" (two parallel changebars) or a dashed changebar or something like that. I have tried to use nested changebars but I was not able to alternate the \changebarsep for the second changebar only. Is there a feasible solution for getting different changebars?

Update: The solution should also work for changes that go over two (or more) pages.

Here is an example code:

\documentclass{article}

\usepackage{changebar}

\setlength\changebarsep{30pt}

\begin{document}

This is some text.\\

\cbstart 
Here is some text that has to be marked with the usual changebar.
\cbend 

\bigskip
This is some further text.\\

\cbstart 
\setlength\changebarsep{15pt} %this seems not to have any effect at all 
\cbstart
Here is some text that has to be marked with a different changebar.
\cbend 
\cbend

\end{document}```

Answer 1

A tikz solution:

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{calc,positioning}
\newcommand{\tikzmark}[1]{\begin{tikzpicture}[overlay,remember picture] \coordinate (#1);\end{tikzpicture}}
\makeatletter
\newcommand{\myfsize}{\f@size pt}
\makeatother
\newcommand{\cbstart}[1][1]{\xdef\myArg{#1}\tikzmark{cbstart}}
\newcommand{\cbend}{\tikzmark{cbend}\foreach \i in {1,...,\myArg}{\begin{tikzpicture}[overlay,remember picture]\draw let \p1=(cbstart),\p2=(cbend),\p3=(current page.east) in ({\x3-2cm+\i*0.1cm},{\y1+\myfsize})--({\x3-2cm+\i*0.1cm},{\y2});\end{tikzpicture}}}


\begin{document}

This is some text.\\

\cbstart 
Here is some text that has to be marked with the usual changebar.
\cbend 

\bigskip
This is some further text.\\

\cbstart[2] 
Here is some text that has to be marked with a changebar different Here is some text that has to be marked with a different.
\cbend 

Some other text

\large
\cbstart[3] 
Here is some text that has to be marked with a changebar different Here is some text that has to be marked with a different.Here is some text that has to be marked with a changebar different Here is some text that has to be marked with a different.
\cbend 

\end{document}