I looked over the second option and it's a pretty extensive patching process. The 2-3 hours they give for it is generous. Also it appears that they do do windows update manually, so it's still a fully up to date Windows 10 installation. I suspect you could get away with just running their script on a legit, fully updated, Windows 10 install, with presumably the UI modifications they want you to do (says the scripts need you to do that).

I never really looked too deep into Ameliorated Windows, just saw that they have their own ISOs. From memory, nLite came with a slick installer that you just supplied an ISO to and chose some options, and it did everything for you.