Ok, this is being tortuous. First of all: define a strategy. If you are going to create the resources in Neutron, define how. I've provided a way to do this, find a formal strategy to ground it.

Second: (again) try to find a connection between resources, if you are going to use the strategy of creating the resources in Neutron. The "Logical_Router_Static_Route" belongs to a router univocally. If that router has been created by OpenStack, then you can modify the DB sync method to consider learned routes too.

In order to do this, you'll need a set of resources that are going to be needed in Neutron, the OVN counterparts and other resources (like "Logical_Router_Static_Route") that will be added and will be present in OVN and not in Neutron DB. Also you'll need to know how to relate all of them.