Sorry for derailing the discusssion, and thanks Aliceoff for clarifying some of my confusions regarding your threat model.
Graphene18 hardening Windows is not that easy since you don't have as much control compared to some Linux distributions like Qubes OS. Definitely try to get an Enterprise or Education license for full telemetry settings. You might also look into Windows 10 Enterprice LTSC 2021, which is the most stable and secure Windows today because it comes without feature updates and is stripped from "Bloatware". It is hard to get a reasonably priced license though, and it won't work well on newer hardware. Windows 11 LTSC will probably not come out before 2025, so that's your best bet.
But here are 2 overkill ideas that might be interesting, too:
If you have a powerful enough machine you could run Windows in a virtual machine on a hardened Linux host system. That would allow you to quickly reset your machine to a fresh install or use multiple windows installations next to each other (one online and one offline for example).
Back in my Windows days I used to make a full disk backup of a fresh, hardened Windows install that had all my needed software set up. Every other week I would wipe the disk, restore the backup, run the updates and have a blank sheet again and therefore minimize my risks and damage potential.
Edit: Typos