Today I managed to create a KML file by Lightroom export. You can play with the file by clicking here.
Thanks to Timothy Armes who created LR/Transporter. He was very responsive wrt to my enhancement requests such that I could use this to create a KML file for google earth. As of now I have to manually add the track and to zip it. But even this will hopefully getting better soon.
I plan to finetune the export settings somehow and to publish it here.
Read the rest of this post to see the embedded example.