Gareth,
We've enough amount of license for Arbortext 5.4.But Upgrade is not a good option for now,we can add it in our roadmap.
We're ready to configure it using any license manager but guidance is required.I've even raised a case with PTC.
I've seen in PTC Support notes that PTC do not assist in any Citrix configuration.Thought to check if we can get the help from the experts.
Thanks,
Mandy