I would imagine this is not possible given the restrictions of PSM, but just in case it is possible, is there a plan in place? Is it already possible? Thanks.
The Unity integration does not currently include support for PSVita. I haven’t looked at PSM so I cannot say whether or not it is technically feasible to support, only that it is not currently supported.
I’ll ask my Unity account manager about native plug-in support in Unity-for-PSM. At least then you’ll know what work’s involved if it is possible.