Splunk Addon For AWS SNS Topic Code fails for external AWS Accounts

[splunkme3]

Has anyone had an issue with posting to an external AWS account's SNS topic? External being an account different from where your Splunk instance's IAM role lives. I have noticed that the SNS Topic alert action is limited to only SNS Topics where the IAM lives. I have submitted the following idea to Splunk. 

Splunk Addon For AWS Code Modification avoid listTopics in SNS | Ideas

If anyone has been able to get the alert action to post to an external account using their IAM role, please share your solution here. If not, an up vote on the idea would be much appreciated. I see it as a simple fix for the app to make it more flexible. 

Also submitted a case with Splunk detailing the issue: Case: 3812674 | Splunk

[ghantk]

I had the similar use-case, we have used SNS(from local)->SNS(different account). https://docs.aws.amazon.com/sns/latest/dg/sns-create-subscribe-endpoint-to-topic.html