Yes, I understand your problem. There are many way to recover from the situation. Chris is the best to ask about this.
However….I was looking into this myself as I am waiting for the Surbook and would like to prepare for a windows recovery if necessary. Your problem is so severe that I will suggest something to try. First go here to look at a way of booting a USB pen with the downloaded image:
http://forum.chuwi.com/thread-3565-1-1.html
This is for the Chuwi Lapbook 14.1, but it may work to get into the Surbook boot menu & then pick up the windows image from a USB pen. It may be risky as I am not familiar with the disk layout on these tablets; they may be the same as each other or maybe not.
The forum will have other tutorials that may be adapted to your problem, so some additional reading may be required.