Every couple of years, even with sometimes buying other systems, I tend to treat myself with a Titan Mobile Workstation. Hands down, the best laptops I've ever owned and can be ordered with insane/absurd levels of performance.
Anyhow, unless they've changed in the past 8 months, those can be ordered with no operating system.
They're pricey if you want them to be, but they're otherwise reasonable. Hmm... I'll get you a link. (I am in no way affiliated.)
Titan X4K is one of the most powerful and highly portable Mobile Workstation Laptop in the market featuring i9 CPUs with speeds of up to 5Ghz and Quad-channel DDR4 memory. Available in 15.6" and 17" format.
www.titancomputers.com
Play with their configuration tools and you can make 'em rather pricey. They're otherwise not too expensive for what it is. I've bought a few over the past decade and a couple of times I ended up with a laptop that was more powerful than the desktop I was using at the time.