SQL & PL/SQL

My case is the following,

I'm trying to implement an AFTER trigger which uses the :new.blob_field to insert the new value in a table. Because of the documented AFTER restriction and :new use for blob fields, I've though to add other BEFORE trigger that calls a procedure in which I can store the :new value and later insert the temporary value in the table when the AFTER trigger is executed.

The Idea is the following:

BEFORE trigger :new -> TEMP

and then

AFTER trigger uses TEMP to store in the new table

So, the final questions are the following:
-Any other idea to do the same, that is, to use the ":new" value in an AFTER trigger?

-How can I do this with the temp variable, is this correct?:

PROCEDURE store_blob ( new_val BLOB ) IS


BEGIN

DBMS_LOB.CREATETEMPORARY(new_blob_temp,TRUE, DBMS_LOB.SESSION);
-- fill with data
DBMS_LOB.COPY (new_blob_temp,new_val,DBMS_LOB.GETLENGTH(new_val),1,1);

END store_blob ;


Because of the design of the application I have to use the AFTER trigger to store the new value so I must find a solution for this type of fields.

Sorry for the size of the text and also for my english.

Thanks in advance