redirecting some air from outdoor A/C compressor into the attic to cool it down
Directing air from outside compressor into your attic would reduce the air flow from your compressor and probably decrease the cooling ability of it. A better solution would be to install an attic fan that vented to the outside. The problem with that is that you suck in humid air from the outside.  If you've got good insulation on the attic floor why is the attic temp a problem?  I live in S. Florida and my attic temp is really hot but with great insulation it doesn't affect the living space below.