Simply open the xfdumanifest.xml in SNAP.
Do the reprojection (Raster/Geometric Operations/Reprojection) and select the reprojection you like. Click the option not to reprojection the tie-points. Don’t save the product to disk yet.
Remove all bands except the OLCI CHL_OC4ME band. You can simply select the bands in the product explorer and hit the <DEL>-key. Actually, this should be possible by the Subset operation (Raster/Subset in the menu) but there is a little bug at the moment. That’s why you need to delete the bands manually.
This could also be done on the command line and performed on a stack of products if you need it.
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