I will be going through the process I have been using for recovering an Uninitialized drive. I wanted to check the messages you posted earlier concern your system in Diskpart.
My uninitialized drive does show a Size and Free space the same, which is the full size of the drive. When I list the partitions, it says the drive contains no partitions and if I select partition 1, I get the Virtual Disk Service error: disk is not initialized.
Since you have to wait until tomorrow anyway, maybe we can use Diskpart to check your remaining drive as practice. You seem to have knowledge already, but maybe some details will be important.
So boot to the recovery media and run Diskpart again and do the list disk (lis dis) command. What does the current drive show as far as size and free space, and is there an asterisk under the Gpt section?
If the drive is still showing as no free space, I would be a little worried because it is not good to run a drive without extra space available. But again, if we do this process, I will ask you to remove the second drive so there is no confusion. When you get the OS drive back, make sure the install secures the drive and does not let it move around. The sensor messages may end up being relevant, especially if that sensor had the ability to disable the drive.
We can go over the procedure to recover the drive tomorrow if you want. But as a peek, the process will require booting into the Command Prompt and converting the drive to GPT, then booting the Partition Wizard 8.1.1 bootable home version to recover the partitions. Then we have to boot back into the Command prompt, and create the MSR partition then reset the Partitions for their specific configurations. After that we run Bootrec /rebuildbcd and you should be done.
You asked about booting the Windows Boot Manager. If you get to the Boot Device Menu, you will show a listing for any bootable device. If you are running Secure Boot, it may only show UEFI bootable devices. If you are running to allow both Legacy and UEFI you will see for instance, a Legacy and UEFI version of the Flash drive. You will need to boot Partition Wizard as Legacy, so it will be necessary to have the system set so as to allow it, which probably means CSM enabled and Secure Boot to either Legacy or UEFI. But bioses are set up differently so I cannot give you specific guidance.