sometimes it gets very annoying to have to upload the same playermodel again due to a small error in the rig, so it would be easier just to update the existing playermodel
You can already do this. There is a way to overwrite a model once it is on workshop through the editor.
More specifically, if you go to your uploads tab in the workshop editor and click on the entry for your desired model, there is an option to select a file (.plymodel or .model) to update. Simply make sure your new model is imported with proper metadata, and then select that .plymodel / .model file.
thanks for help, I hadn’t noticed this option yet