I still think in your case the best choice is a data layer. To my knowledge, the only direct import is a LOR SuperStar sequence. This is because one of the developers added SS effects. There aren't direct Vixen 3 effects. So, even if the import would work, you would end up with a bunch of node level, on/off effects. This would be painful to manage.
It sounds like you don't want to redo your sequences, which is understandable. My advice is keep what you have, import as a data layer, and add to them in xlights. Then any new sequences can be done solely in xlights.
Whatever avenue you choose, good luck.
James
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