For all its thoughtful logic, the most important essential point made in the link below is that 'it would be necessary for a Lama to compose the sadhanas'.
Dorje Shugden is Dharmapala, and though we say he is the embodiment of the Guru, Yidam, and Protector, it means he is the nature of our Yidam, not that he can be relied on as a Yidam. It is inappropriate to conclude, for instance, that because we practice Vajrabhairava, we can transform ourself into Dorje Shugden. Until we see a Lama present an initiation and commentary to a generation and completion stage practice of this Dharmapala, we would experience profound benefit by concentrating on the actual Yidam practices we've been given. I've never heard of him as a Yidam except through people's curiosity and logic on this website. If you do hear of it, or make offerings and requests and your Lama composes such things, please do share. Until then, before this opportunity disappears, best get to it with the Yidams already provided.