Need ability to inject js inside googletag.cmd.push function

I need the ablility to inject some JS just before the first service tags inside of the googletag.cmd.push(function()
Just after line 689 in dfp.module.

I need this because I am trying to integrate BlueConic with DFP. They need the ability to set key|value targets on any DFP ad tags.

Here is the code I will need to inject

// BlueConic targeting parameters
  if (typeof Storage !== "undefined") {
    var targetingParamStr = localStorage.getItem("bcDFPTargetingParams");
    if (targetingParamStr) {
      var targetingParameters = JSON.parse(targetingParamStr);
      // set page-level targeting parameters
      jQuery.each(targetingParameters, function (index, param) {
        window.googletag.pubads().setTargeting(param.key, param.value);
      });
    }
  }