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As far as I know there are no open nodes anywhere. But I have not been searching for them. Generally you don't need a full node / a full implementation to get the data from the lnd command subscribechannelgraph.
Basically you will only need to reimplement BOLT 07 ( https://github.com/lightningnetwork/lightning-rfc/blob/master/07-routing-gossip.md ) to ...
1
It turns out, it is grpc nomenclature. According to the documentation at grpc.io:
gRPC users typically call these APIs on the client side and implement
the corresponding API on the server side.
...
On the client side, the client has a local object known as stub (for
some languages, the preferred term is client) that implements the same
...
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