Steve,
I know this doesn't answer your question, but have you considered simply connecting your Kindle to the computer via the USB cable?
That way, you could set up a simple batch file that copies the .MOBI file to the Kindle. If you use Calibre's timer to trigger the RSS download, you could use the Windows Scheduler in a similar way to fire the batch file, say, five minutes after the Calibre download starts.
It's true that you'd have to physically plug in the cable, but, apart from that, the process would be automatic.
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