is it possible
 

to make the announcebit like my modified postbit? (since there are no offlinebit templates etc)

Yes.

yea ok thx, but how ^^

well, the first thing you can do is take your postbit code, copy it, and save it somewhere. Take out the PHP varibles since most of them will be useless. Open annoucments template, take out some PHP varibles in there, put them in your postbit, put your postbit in the annoucments template save.

And if you managed to understand that then you deserve a medal:)