Hi Nehemoth,
I am not sure why are you trying to get your life more difficult that it needs to. Why not just install your SSO using MS SQL Experss on the SSO VM it self. That is supported & scale to the maximum that vCenter allow. For more details on best practices and options for SSO in general and SSO DB in particular, please feel free to visit my blog post:
vCenter Single Sign On 5.1 best practices
Hope this help Image may be NSFW.
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Regards,
Eiad Al-Aqqad
