The problem is more than Secure Boot (though I believe the T3600 does not have the capability of Secure Boot having been introduced with Windows 7). You have TPM 1.2 and an unsupported CPU. So if you do  manage to install Windows 11 on your system you will not receive updates from MS. It is not clear which updates you would not receive but you would run in an unsupported mode. And this video describes the waiver you would have to agree to upon installation.   
Hi. Is there a trick/way to make T3600 suitable for installing W11? Currently, I can't see the "Secure Boot" option in BIOS settings and have TPM 1.2 with Intel Xeon E5-1650 0 @ 3.20Ghz processor. Also, I can select the UEFI option in the Boot Sequence tab, but it can't find any OS while starting the PC.   [IMAGE][IMAGE]
Running W11 on T3600