[c-nsp] OSPF redist customer routes

[CiscoNSP_list CiscoNSP_list]

Hi Guys,
We currently run OSPF across our POPs - redistributing connected + static subnets.
So, provision a customer tail, and all POPs know about the new subnet....and also if we statically route an additional subnet to a customer, all other POP's are updated.
Our issue is if we need to run OSPF to the customer(eg if they have redundant connections), and they require an additional subnet(So they advertise the additional subnet back to us via OSPF), the only POP that is "aware" of the advertised additional subnet is the one that has the OSPF session to the customer - All our other POP's dont see this advertisement as it is within a different OSPF process to our "Internal" OSPF process - Solution is to redistribute ospf process(customer) in our "Internal" OSPF...but we also have to use route-map/acl to ensure they dont potentially blackhole us(by advertising something back to us that they shouldnt)....Is there a "better" way to be doing this?  As having to redistribute customer ospf/controlling that redist with route-map/acl just doesnt seem like a "good" solution?(At the very least, it's terrible to manage)  

Thanks in advance for any suggestions.