Changing template first post via plugin

[Asterix_ita]

Hello My forum has the type of display postbit the post, now I created a template postbit_first_post because I want the first post in certain forums have a different view, I was wondering if you could make the switch via plugin templates from postbit to postbit_first_post (only for first place and in some forum) so as to keep the code clean, if you like?

I asked through plugins and templates as the secondary path of change postbit with VB if (and put all the code of the template secondary) it is feasible, but then the code would be very readable for any future changes.

Excuse the beginner is to vb programming and that my English is poor.

Thanks to all