I had a look at the original xml file, and the I and D files of my Sky. I used that information to change some of my Lutron commands, so i am using numericentry1 to call my scenes, and it works !!! As you said, it is a bit tedious though, and it took me quite a while of trying different things before i found the right way to change the original dev file, then reconvert until everything worked. But i have full access to my Lutron lighting now from Vera.
Next project: macros...
If anybody has any pointers of where they are (which file) and any ideas or suggestions of how one could convert them i'll give it a try and report back here