P1, P2 and P6 as a combination for exam sitting

I know it is compulsary to PASS Essential papers before heading to Optional papers. I am left with Professional Module. The online exam entry does not accept my request to take the above sitting without including P3 paper.

So, I came up with an idea to pick all papers (P1,P2, P3, P6) in an Early Exam Entry Online. Before the date of Standard Exam Entry I can try to amend my exam entry by excluding P3. Is this possible? I want to know whether anyone tried it or is it possible or not?

My only purpose for doing this is to gain revision gap where it is not possible by giving P1, P2 and P3 papers in a row.