incompatible instance types selected in new AWS regions

Using AWS EC2, if I specify minRam 4096M and minCores 4, I get a VM fine in some regions (eu-west-1) but errors in others (eu-west-2)

AWSResponseException: request POST https://ec2.eu-west-2.amazonaws.com/ HTTP/1.1 failed with code 400, error: AWSError{requestId='...', requestToken='null', code='Unsupported', message='The requested configuration is currently not supported. Please check the documentation for supported configurations.' ...}

I assume this is because some instance types are not available in some regions.

Can we do further filtering on instance type selection so that minRam/minCores work as expected?