I am only an amateur but I think you can add a bracket to the opposite side of the of your front end with the pulley in line with the harmonic balancer. Then you can run a fan belt to your air con , or use a longer belt to run from motor to alternators  to air con . However they must be unaligned to provide grip on the pulleys . The bracket could be made to allow adjustment  or the adjustment could come from the alternator side of the motor .You may even need to change to a double pulley harmonic balancer.