I've been using the Tarmak transitional layout files for Mac OS X and noticed that they only support the older ETOIR variant. I've modified the original files to create a layout bundle for the newer ETROI variant and combined layouts from each variant into individual bundles.
Hopefully this helps anyone else who has run into a similar situation. The bundles have been uploaded to Github and include a simple one-line installation for either variant. Please let me know if you have any questions.