Hi,
we have the same requirement:
Connect local on-premise HANA to HCP instance, but we run
into a kind of a deadlock 
by trying to establish a Smart Data Access to our HANA Cloud Platform instance.
On lacal machine
1. We configured unixODBC - it works
2. We connect to HCP, neo as well as Cloud Connector + HANA_DB Service on Port 32215 - it works
but
as soon we start the local HANA instance - localhost is associated with this HANA instance and we cannot point ODBC to the HCP instance, which works with isql connection when the local HANA instance is down.
Do have any idea how to solve?
Thanks and regards
Alexander