The trouble is that it is unknown when\if AY will rebook you and onto what and whether they will do it as an offer for you to accept or it will be automatically done and you will just be informed.
Until you know that it's difficult to give advice. There is usually someone around on this forum, so I would wait until something happens and possibly seek advice then. If it happens over 24 hours before flying you need to do 'something', if it happens nearer than that ORC should work. Strikes are often cancelled last minute as a negotiation strategy so AY cancelling flights far in advance of the actual strike dates is unlikely as it removes their flexibility in negotiation. Leaving it to the last minute to make cancellations has very little cost to them, just considerable additional uncertainty for customers. Although I appreciate that in this case it does look like they will be making some pro-active cancellations.