Is there a good way to determine that a Trigger did not send (e.g. due to a "missing variable" error)?

[kvnn]

The best idea that I can come up with is:
(1) send the (email, in my case) trigger with a unique data parameter
(2) query https://beta-api.customer.io/v1/api/campaigns/{{campaign_id}}/messages, searching for that unique parameter
(3) checking failure_message

It would be very nice if CustomerIO would return a unique ID from the Trigger POST, but afaik that never happens.

So, does anyone have a good way of determining the status of the Trigger, post-send?