I’ve had issues putting other OS’s on my 15v4. I never could figure out if it was the LK or PureBoot, etc. I haven’t tried it again recently since the newer version of PB were released in the last 6-8 months. but, I did get Qubes 4.0.3 installed on the 15v4. It seemed to work fine, and there wasn’t much I had to do, but I was also an experienced Qubes user. I decided against using Qubes on it because the multple VMs seemed to keep the CPU’s busier and the fan would always be running. I just didn’t like hearing that. I do think the 14v1 could be a better option. Also, I’ve noticed running i3wm really is nice, becuase it takes so much load off the CPU for running the desktop. That or xfce.
I’m not answering your question with Qubes and LK with PB. I know it should be fine as I’ve heard others use it, and I did get it running myself on my 15v4.