Ev,
I am afraid that what you ask is definitely not possibile, because the PSR and the XV have completely different sound engines, internal waveforms and so on; unfortunately there is no way the PSR can aknowledge the XV sounds; even if there was a theoretical possibility, the XV patches point to internal sounds (waveforms) which are completely different compared with the PSR.
On my 9000 pro (and I think also on your PSR 9000) the user sound area has the purpose to save internal sounds edited/tweaked, modifying parameters like DSP, filters and so on and the memory available for storage is very limited anyway.
Maybe the best thing you could do is select a few patches you really like on your XV and use them together with the PSR. Example: you could layer a solo sound from the PSR with a pad from the XV (or viceversa); however, for ease of use, I would advice you to limit the choice to maybe 10-15 patches, so you can easily select them with the "value" knob.