Are there any solutions?

What do you want exactly ?

i want PM button near the author avatar to be displayd.

Install Aicontactsafe + Aicontactsafelink plugin. Arange in AIC settings mail profile with that user ID field, and you have it.

Put code for AIC in template near user avatar. You have an example for Sobi at AIC forum, works in K2 too, little modified.

 

Can´t you just use search at forum and Google a little bit ? No offense.

You will need to give all users separate categories. Otherways you cannot make template override and AIC wont know what user to refer. (you have just one template PHP file for users).

If it is not so important to have that button just beside user avatar then you can have it everywhere in K2 Item.

 

Or it has to be maybe some other solution.