MTP is a protocol. It gives a presentation of the SDCard. This actually mounts it like an SDCard reader so you can use regular Windows tools to fix your issue. You can reboot to payload, so no need for jig and injector.
Bottom Line: Trying to get you around “can’t” and get you to where you “can” do what @Hayato213 is suggesting.
Sorry for late reply but how do you reboot to payload without using jig and rcmloader ?