setting a keySignature

[lilypondtester]

I know that 
\set Staff.keySignature = #'( (2 . -2) )

affects all E notes in all octaves. In the key signature, it displays a flat
symbol over the 4th line of staff(which is an E note). Is there any way that
I can change this display such that the flat symbol in the key signature is
displayed on the 1st line of staff (which is another E note)?

I know that using 
\set Staff.keySignature = #'( ((0 . 2) . -2))
It is possible to display flat symbol of the key signature on the 1st staff
line, but then it just affects that octave, which is something undesirable.
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