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Geometry nodes and multiple representations
Blender's Geometry nodes now provide a new node allowing to switch between different geometry representations (lod like)
So may be a possible solution to store multiple representations of a single object right in blender and switch on demand using python to automate the process.
Comments
Any ideas how Blender stores this internally in its data model? Right now, I simply store different bpy.data.Mesh.
You may rely to data.mesh through object info node or node based full parametric entity using nodes primitives and booleans.
This is a revolution in blender's world, providing a true support for parametric objects out of the box, without drivers, but may be a bit compicated to properly setup a node tree for complex objects.
There's also this Blender Level of Detail add-on by user BD3D: https://devtalk.blender.org/t/level-of-detail-addon/12840