Bad effort because of lack of knowledge.
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
CAST(NULL as int) as Col1,
CAST(NULL AS nvarchar(50) as Col2,
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.