My 2 cents on the topic, since you don't have enough 10Gb ports on the cluster members, why aren't you using some Access switches (a cluster for redundancy) to extend the ports and create Vlans over bundled 10Gb members interfaces?
Then you can terminate as many connections to the Access switch and you can overcome the limitations of the lack of ports.
In our environment we have bundled two 10Gb towards the LAN side and two 10Gb towards the WAN side.
On the WAN bundle interface, we have subinterfaces/vlans used accordingly...
PS: for redundancy/high availability, don't terminate things into single ports - my take here.....