Answered MIGXdb and the migxchildresources package

$parent = '583';
$newstemplate = '9';

$this->customconfigs['yeartvid']=83;
$this->customconfigs['newsparent']=$parent;
$this->customconfigs['newstemplate']=$newstemplate;

$parentids = array();
if ($newsparents = $this->modx->getCollection('modResource',array('parent'=>$parent))){
    foreach ($newsparents as $parent){
        $parentids[] = $parent->get('id');
    }
}

$this->customconfigs['parentids']=$parentids;

$tvnames = array();
if ($template_o = $this->modx->getObject('modTemplate',$newstemplate)){
    if ($tvs = $template_o->getTemplateVars()){
        foreach($tvs as $tv){
            $tvnames[] = $tv->get('name');
        }
    }
}

$this->customconfigs['includeTVs'] = 1;
$this->customconfigs['includeTVList'] = implode(',',$tvnames);