We are also independently working in the Muniments Project with Preston McFarland and Peter McFarlin ... for its own merits and in hopes we might find more Elanvow information hidden there. Even though the island doesn't seem to appear in the Index created earlier, we already see a genealogy in Walter's hand that reads "Island-vow" ... so there may be other yet undetected references.
We did have very nice support from the academic community at the University of Glasgow and the University of Edinburgh on the 1395 charter. Thanks to all those who helped! We are also currently engaged with Morag Cross on additional transcription.
Thanks for your patience and on-going support.