I don't know the answer to your question off the top of my head. I would suggest creating a data action to test the endpoint that the customer is interested in.
If data actions do not support the encryption options provided by the endpoint then your test of the data action will fail, typically with a SSLHandshakeException in the error message. For example, attempting to connect to https://3des.badssl.com/ will provide this error message:
SSLHandshakeException: Received fatal alert: handshake_failure
If the customer's goal is to avoid using ECB then they can control that by the configuration of the endpoint.