I have CloudWatch alarms across several different AWS accounts and several different Regions.

I would like all of these alarms’ action notifications (e.g. “alarm X changed from state OK to In alarm”) to populate a single SQS queue. Is there a way to do this without creating individual SNS topics/Lambda functions in each Region? I.e. in an ideal scenario, there could be a single topic/function which all the alarms could use for their alarm actions (based on my understanding though, this is impossible).

Note: I am aware that CloudWatch supports a cross-account cross-Region console to view alarms, metrics, etc. from other accounts/regions in a single Dashboard, but this is not what I am interested in. I am only interested in aggregating all of the alarm action notifications into a single queue, and the optimal way to do that.

Attempt: I have tried using the SNS topic in Region B for an alarm in Region A, and noticed that CloudWatch reports an error indicating that the regions cannot be different. I tried the same thing with a Lambda function and received a similar error during alarm creation.