We just did a buch of vocals in the control room for the same pitching reasons..
verses were ok in the live room, but on loud choruses, we did EM in the CR.
My assistant suggested recording a pass of the mic in the CR - same level, but with no singing, he flipped the phase and as we balanced it up with a vocal track - the bleed was greatly reduced (say by 70%) and the vocal remained unchainged tonally.
Bleed was a worry for us because we wanted to use a litle Auto Tune later and it doesnt like 'chords' or any spill at all..
We had the monitors up REAL LOUD (Genelec overload lights blinking we had earplugs in ) and were using a very sensitive mic with plenty of compresion (M149 / Neve 1073 / UA1176)
So thats why I am calling my assistant "my engineer" from now on!