If they're Skylake or newer and the Lenovo has a TPM + UEFI Secure Boot, you can probably clean-install Windows 11 without a hitch. I recently reinstalled a Win10-era Asus ZenBook with a Skylake m3 which Microsoft claimed "is not supported" but a normal, unpatched Win11 setup USB worked fine and Windows Update runs properly. (It doesn't complain about unsupported hardware as it would)