Clan War: Ready/Not Ready or In/Out Function

Problem:
Some clan members disappear for days at a time, but there's really no way to tell until after a war has begun. This potentially leads to a disadvantage.

Proposal:
I propose a clan war pre-action for leaders that activates a poll (push notification please) that asks members if they are ready (or not ready) for a clan war. The poll will run for 6|12|18|24 hours (leader setting), at the conclusion of which the leader has the option to war search with a roster size of only those that responded "ready".

I like the idea. Would love to have it...