Finally sussed out the hopefully easiest route of getting altitude data for converting TopoRoute to Sanoodi GPX files - Google Earth. Doh!
Its got a COM API and with methods to query altitude data. Should be simpler (famous last words) than trying to access a web service type of interface.
Then again, having a visible map via an embedded IE browser could be a nice feature to have (phase 2 maybe?). Could I display Google Earth as an OCX in a separate window?

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