Support for `CALL` in Amazon Neptune OpenCypher queries

I need a query which returns me a node with label TOPIC against a particular user. The conditions of the query are the following

1. (u:USER { id: <user_id> })-[:follows]->(t:TOPIC) - follows relationship does not exist
2. (u:USER { id: <user_id>})-[f:follows]->(t:TOPIC) - f.status is DELETED

I found a way to do this using the UNION keyword

MATCH (u:USER) WHERE id(u) = <user_id>
MATCH (t:TOPIC) WHERE t.status = 'ACTIVE'
WITH u, t
MATCH (t) WHERE (NOT (u)-[:follows]->(t))
RETURN t
UNION
MATCH (u:USER)-[f:follows]->(t:TOPIC) WHERE f.status = 'DELETED' AND id(u) = <user_id>
RETURN t

But, I need to perform pagination over this query and order them by an attribute. The only way to perform pagination over a UNION is to put the whole query inside the CALL {} construct(mentioned here). Currently, Amazon Neptune does not support CALL {} for OpenCypher(mentioned here).

Will the CALL {} construct be supported by Neptune OpenCypher soon enough? If not, is there an alternative query which will solve my use case without using UNION?

Any help would be highly appreciated.