How to route two vlans on two switches that are connected only on one router?

Suppose that any of the trunk links fails or if you want, suppose that there is no link between SW1 (G0/1) and SW2 (G0/1). How can you make computers in Vlan 10 to see computers in Vlan 20 and viceversa?. I tried creating a bridge group on the router for G0/0.10-G1/0.10 and another for G0/0.20-G1/0.20. Then define interface BVI10 and BVI20. Interfaces came up but you can not configure dot1q on them and switches can not see them. Anyways with one interface on the bridge group going down the BVI interface goes down as well so that's not an option. Router should be 10.10.10.1 and 20.20.20.1 and each computer have that as gateway respectively.

Jody thanks very much!
Indeed the encapsulation was done in the sub-interfaces, as posted in the OP you can not [encap dot1q X] on the BVI interface. Even though, the switches didn't established the trunk with the BVI. Anyways using bridge groups is not an acceptable solution because with the failure of any interface of the trunk links in the router, the BVI interface goes down as well.
You said "if I want to handle it at layer 2" How will you do it at layer 3? I though something like HSRP or VRRP but that doesn't apply since it is only one router. Remember, the router must be able to route between vlan10 and vlan20 for computers on both switches in case of one of the trunk link failure.
This is for learning purposes so I started with Packet Tracer but PT doesn't support bridge groups. Then I tried GNS3. I will try with the router in GNS3 with a switch module but I'm not clear. that will be like having a 3rd switch, right?  What I mean is that I will not be using routed interfaces between the router and the switches, right?

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