Sysprep is required to inject the landesk client into your image. if you are using provisioning, you could also use a unattended setup. this should work with oem too.
another way you could integrate your ldms agent into your image, for this you must delete neccessary client guid's.
Sadly correct, because it doesn't solve the problem of SysPrep being unavailable on OEM Windows. Have to figure some workaround for that. So far no luck.