Clean install as well as in-place upgrade to Windows 11 works without hardware requirement for Secure Boot and TPM check as long as appraiserres.dll has been deleted from the ISO.

Or create reg file copy it onto usb stick and during install when the hardware requirement error appears, press F10 to open command prompt, type in notepad and press enter, go to file→open, select all file types and right-click the reg file and select merge. Close notepad and the command prompt and repeat the hardware requirement check and it will continue the installation now.

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SYSTEM\Setup\LabConfig]
"BypassTPMCheck"=dword:00000001
"BypassSecureBootCheck"=dword:00000001
"BypassRAMCheck"=dword:00000001
"BypassStorageCheck"=dword:00000001

Source:
https://www.deskmodder.de/wiki/index.php?title=Windows_11_auch_ohne_TPM_und_Secure_Boot_installieren#Windows_11_als_Inplace_Upgrade_oder_Clean_Installation_ohne_TPM_und_SecureBoot