Using cross-region certificates for regional endpoints

[marceliwac]

My application stack utilises a single certificate for a base domain (example.com) and several sub-domains (restapi.example.com, websockets.example.com). Both the website and the REST api deploy to EDGE endpoints, while the websockets API uses the REGIONAL endpoint. Because the EDGE endpoints need to be located within us-east-1, this prevents me from re-using the certificate for the websockets API with the error message of:

Invalid certificate ARN: arn:aws:acm:us-east-1:xxxxxxxxxxxx:certificate/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. Certificate must be in 'eu-west-1'.

Is there anything that prevents me from using this certificate for a regional endpoint on the AWS side or does the plugin just enforce this? I provide the certificate via custom.customDomain.certificateArn.