add an item into announcement list in site collec. and repeat the same in all the sub webs' announcement list without using event receiver

hi,

I have a requirement: 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 eacha nd every subweb of my site collec 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?

any other approaches are highly appreciated!