VeraCrypt and MrChromebox

Ok. Here's the situation. I have a Lenovo X131e that used to be a Chromebook. I flashed MrChromebox and installed a stripped down version of Windows 10.

I also have a newer laptop, but it's in the shop. I have its harddrive here. The harddrive is encrypted with VeraCrypt.

I want to boot from this drive in the old former Chromebook. Windows 10 seems to be so robust that it can do this trick; install on one set of hardware, boot on another.

But whenever I put the drive in the old machine and power on, I just get stuck with a blank screen. Nothing happens.

Also, I try to open the BIOS settings at launch with various keys, but I'm not sure which is the right one, and I never get it to work.

So, how do I get this to work? Will MrChromebox and a Veracrypted drive play nice together, or is that not possible? Is that why it's not working? Would it work if I installed the regular UEFI BIOS, and if so, how do I do that on my machine?

Failing all of this, how do I make the machine ignore the drive at boot and just boot from the smaller drive that came with it when it was a Chromebook, on the smaller drive slot? That has Windows 10 and is still bootable, but fails to boot if the larger drive is connected.

Thank you for any help you can give.

Edit, because apparently it's necessary: snarky comments about Windows are not helpful or welcome.