Create a new virtual private gateway. Attach the new virtual private gateway to the VPC in eu-central-1. Use a transit VIF to connect the VPC and the Direct Connect router.

Create a new transit gateway in eu-central-1. Create a peering attachment request to the transit gateway in eu-west-2. Add a static route in the transit gateway route table in eu-central-1 to point to the transit gateway peering attachment. Accept the peering request. Add a static route in the transit gateway route table in eu-west-2 to point to the new transit gateway peering attachment.

Create a new transit gateway in eu-central-1. Use an AWS Site-to-Site VPN connection to peer both transit gateways. Add a static route in the transit gateway route table in eu-central-1 to point to the transit gateway VPN attachment. Add a static route in the transit gateway route table in eu-west-2 to point to the new transit gateway peering attachment.

Create a new virtual private gateway. Attach the new virtual private gateway to the VPC in eu-central-1. Use a public VIF to connect the VPC and the Direct Connect router.