propogate item added in announcement list in site collection to all sub sites' announcement list

In my site collection i have an announcement list. and in my site collection some 600+ sub sites exist. sharepoint admin uploads an announcement into this rootweb's announcement list. now is there any way i can add the same announcement -which has title, description, date time etc .- to all the 600+ sub sites' announcement list?

i know , if i write a list item event receiver i will be able to iterate through each and every subweb of my site collection and add this item into those sub web's announcement list. But, without writing an event receiver and creating and deploying another wsp and avoiding all those headache, is it possible to achieve this requirement