I use a Medium theme on my desktop. It’s not dark or light. It really works for me.
I found it here, https://github.com/blue-mood/blue-mood-kde-color-scheme
I was actually looking for a Med-Dark charcoal theme and decided to try this first. I’ve used it for years now.
Install a Linux Distro. Connect to external monitor, plug power into wall.
Use it for a dedicated torrenting machine or use it as a test machine for whatever you like. If you kill it, whatever.
Otherwise I would just take that SSD out and recycle the machine.