I found there there is a long thread on here where you can force win11 install and it runs ok on older hardware.
And it does not seem to difficult.
the problem with doing that is MS won't supply any Win11 updates on non-supported hardware when Win11 officially comes out this October
Microsoft told us that Windows 11 devices in an unsupported state wouldn't receive updates via Windows Update, which could include security and driver updates.
- windows 10 ltsc