Then I stumbled upon a half-the-price-of-Dell ECOHERO laptop on Amazon. The first power-on weirdly goes to the BIOS settings, but after that it's a pleasant surprise: no internet connection required, no bloatware, no S mode, the Control Panel is already conveniently on the desktop, and so on. It's like going back in time to early Windows, yet all of Windows 11 is there. Oddly, the vendor appears to have no web site or presence other than on Amazon.
Does anyone keep a list of vendors like ECOHERO that sell machines with unbloated "minimal" Windows?
I do not know the answer to your question but I would be highly skeptical and leery of a random name site with no website and no credentials doing custom installs. This is akin to the days of pirating Windows on Usenet with slip-streamed patches and other customization tweaks by some random person.
That said, I like the idea of a stripped down install. There are some powershell scripts to do this but they often break things. I believe a much better solution would be a well documented site that shows how to network install a windows ISO and strip out garbage during the installation in a reproducible manor. Such things do exist, I just do not spend much time in windows and do not have such links handy. Perhaps the Microsoft admins here could add to this?
In other words, you won't find what you're looking for in today's world.
Or .... You might be able to extract a copy of a real ( = on a running hard disk from a real computer) Windows 7 or earlier installation and convert that to a VirtualBox disk-image.
Which is what I use for 95% of my Windows work and that is the occasional use of my HP scanner's scanning software when I specifically want to use its multi-sheet feeder.
https://www.microsoft.com/en-us/d/windows-11-home/dg7gmgf0kr...
Microsoft also sells their Surface laptops free of bloatware. Also available directly from them.