Schematic Map in GIS Tools?

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Questions:

1. Is there way to leverage GIS tools to author/edit a schematicmap where elements' geometries has canvas-based coordinates rather thanreal-world coordinates on Earth?
2. To possibly achieve this, is there a special Coordinate ReferenceSystem (CRS) that does "No Projection"? That maps an (X,Y) point directly as-is on a Canvas (instead of on Earth)?

Motivation:

I'm maintaining a Geo-database feeding a real-world map. I'd like to also maintain, in parallel, a "schematic map" where I arbitrarily locate the same elements on a planner canvas. So while each element has a Geometry column with real-world coordinates, it also has another geometry column (point, line...etc) with simple X/Y canvas-based coordinates (not real-world) (similar to vectors in an SVG).

Then it would be of great value if I could view/edit this schematic map in GIS tools (like QGIS).

Example:

• A Real-World Map, in one QGIS project, has layers of features using their typical geometry column in a typical CRS (say WGS 84) - this map is typical, no problems here!
• A Schematic Map, in another QGIS project, has layers of the same features but using another geometry column that is canvas-based (rather than the real-world) coordinates.

Although the essence of GIS is to manage elements located on Earth (real-world coordinates), my special use-case would benefit highly from managing a schematic map in the same environment and with the same tools as a real one.

Any thoughts?

NOTE: I'm not trying to generate a schematic map automatically (like ArcGIS' Schematics extension does).



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