Welcome to the forum
Your post is a little confusing as it was posted in the SP3 forum and you state that it works on the SP3?
I don't remember anyone asking abut that before. People who have wanted to create rescue media have been doing it using a bootable flash/thumb drive. Maybe some has an answer.
I assume you went into the BIOS and told it to boot to USB?
I have no idea how to go into the BIOS on this machine. There is no literature which came with this computer which says how to operate it. I just had the USB drive connected, and on, with the rescue disk in it.
I do this all the time with Acronis.
Just hold the volume in the down position, and then press and release the power button.
When you seen the Surface logo on the screen let go of the volume button.
It will now boot to the DVD drive and let you test, backup or restore your Surface.
let us know how it goes.
You will need a powered USB Hub. The Surface USB port is not likely to provide enough power for two devices.
Something like:
Amazon.com: AmazonBasics 4 Port USB 3.0 Hub with 5V/2.5A power adapter: Computers & Accessories