How to reference Instance Profile in .ebextension

I need a queue in my elastic beanstalk application and I therefore create the queue and the queue policy with this snippet in my .ebextensions/app.conf:

  Resources:
    BackgroundTaskQueue:
      Type: "AWS::SQS::Queue"
    AllowWorkerSQSPolicy:
      Type: "AWS::SQS::QueuePolicy"
      Properties:
        Queues:
          -
            Ref: "BackgroundTaskQueue"
        PolicyDocument:
          Version: "2008-10-17"
          Id: "PublicationPolicy"
          Statement:
            -
              Sid: "Allow-Create-Task"
              Effect: "Allow"
              Principal:
                AWS: "*"
              Action:
                - "sqs:SendMessage"
              Resource:
                Fn::GetAtt:
                  - "BackgroundTaskQueue"
                  - "Arn" 

Unfortunately I cannot find a way to reference the Instance profile of my EC2 instances in the autoscaling group. (At the moment the queue is open to the world) I tried two approaches:

1. 
   

   Reading the configuration:

   
   

   
             Principal:
               AWS: 
                 Fn::GetOptionSetting:
                   OptionName: "IamInstanceProfile"
   
   

The OptionName is always retrieved from the aws:elasticbeanstalk:customoption namespace but the IamInstanceProfile is defined in the aws:autoscaling:launchconfiguration namespace as far as I know. -> No luck

2. 
   

   Reading from the actual AWSEBAutoScalingLaunchConfiguration resource:

   
   

   
             Principal:
               AWS: 
                 Fn::GetAtt:
                   - "AWSEBAutoScalingLaunchConfiguration"
                   - "IamInstanceProfile"
   
   

This approach fails cause the property IamInstanceProfile is not exposed.

Has anyone found a way to make such a policy work? Does anyone know how to instruct GetOptionSetting to look in a different namespace? Anyone found a way to GetAtt the instance profile?