Hi Diane and Hannia,
Diane, I'm sorry I have not gotten back earlier. Unfortunately, you're right, I am not able to surprise you with any good news. I do not see any other way but for checking records or driving from one village to another and knocking on the doors in the villages and try to catch the trace.
I have some research in Ternopil area planned which was postponed because of the snowfalls - I have only dug my car out from under the snow a few days ago. I am planning to go the next week. I could combine it with doing the legwork in Nastasiv area for you. I must admit things do not look promising but if I start it I will leave no stone unturned.
Please, contact me at firstname.lastname@example.org
if you're interested.