Hello, I've started learning inkscape in order to remake a raster map from a videogame using paths. The problem is, I've encountered a few spots where the road is 1,5 or 2 pixels wide. I was looking for a tool that would transform my paths into 2 separate ptahs that are 1 pixel one from another, and I found the Offset tool. The problem is, it requires a closed path to work and it just forces my path to closed by linking their ends. Is there a way to make it work on unclosed paths too, or is there any other tool capable of doing it?
What I have:

What offset tool does:

What I want to have:

Here I've just created a second path by hand, but I've already created a few dozens of paths that are much more complicated than this one. Is there a solution to this problem?