Hi,
this is not possible and it will not be implemented in the near future. I have posed this question for a C3560-E switch, but did also some research for a C3750.
Only switch that supports this is a C4500, C4900 and a ME4900.
Because I needed only 2 VLANs bridged to my access switch with PVLANs, I used 2 cables, both configured as promiscuous for a specific private VLAN.
HTH,
Dario