If anyone is interested I found a solution.
There was a bug in the version of 6.5 I was using. I downloaded 6.5 update 1 and got past the issues. However I ran into further issues which lead to a different approach which was successful.
I ended up going for a nested deployment (installing VCSA/PSC on a virtual host deployed in workstation). I also ended up running the install wizard from the ISO instead of importing the OVA in workstation.
Hope this helps anyone else encountering this issue.