Payday 2 models for MikuMikuDance
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I wanna use these models for MMD, but how do I convert these Payday 2 model files (.MATERIAL_CONFIG and .TEXTURE) into .Obj files to be imported into Blender and then exported as pmx files/models?

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You get the model files from the inside of payday 2 asset.

Use bundle modder to extract the entirety of payday 2 asset (it will take some time depending on your cpu and ram)

The reason those stuff you linked doesn't have .model files is because it only override/changes the texture of the model.
You must get the model itself from the internal asset of the game.

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