Create a bridge for each vlan (be careful with (R)STP on vlan-bridges: you can experience funny behaviour with switches not capable of per-vlan-topologies, I'd suggest to disable STP on those bridges))
create two more vlans on ether10.
Connect those two and the existing two vlan interfaces to the corresponding bridges.
Move addresses bound to the vlan interfaces to the bridges.
MTCNA, MTCUME, MTCWE
There are 10 types of people: Those who understand binary and those who don't.
There are two types of people: Those who can extrapolate from incomplete data