Multiple OBJ to AssetBundle on Server

I have a large number of 3D models (~10,000) in OBJ format that I would like to dynamically load from a server at runtime. Currently I'm using an OBJ reader class, but it is slow and seems like an inefficient way to load an asset.

Instead, I would like to create an assetbundle for each OBJ during preprocessing and send the appropriate assetbundle for a requested model.

However, it seems like I would need to create 10,000 unity projects and individually build asset bundles via the editor or command line. Is there a more direct way of achieving this? Can I create the assetbundles directly, without having to create a unity project for each file?

Closest solution I found was this answer, but it seems to require a pre-configured project file from which the assetbundles are built. Can I create such a project on the fly via command line?