Bad effort because of lack of knowledge.

From BOL:

A trigger is a special type of stored procedure that is not called directly by a user. When the trigger is created, it is defined to execute when a specific type of data modification is made against a specific table or column.

So, create a view. It may be real view or a dummy one:

CREATE VIEW MyView

AS

SELECT

CAST(NULL as int) as Col1,

CAST(NULL AS nvarchar(50) as Col2,

etc.

Create your SP as a INSTEAD OF INSERT trigger on this view.

Perform insert into the view.

Here it is: table passed to stored procedure as system table "inserted".

Works quickly, effectively, in both versions of SQL Server.