ONYX transparent tunnel over layer3 (ospf, qinq, vxlan,..?

Hi all,
i have the need to provide a transparent layer2 connection from one location to the other. The customer wants to be flexible in choosing vlans. With the Vxlan feature I have to bind vlan tags with the bridge, so i always need to know which tags they use, right?
is there a way to combine qinq with vxlan to provide a layer2 tunnel through an OSPF routed network? couldnt find something in the docs

Thanks in advance.