Testing chat add-ins / starting a chat as the agent

Summary

I want to test a chat add-in outside of business hours and can't figure out how to do so.

Content

My company has a workspace add-in for chats. Our current method of testing in production is pretty involved - we currently make a special chat queue, assign a profile to only that queue, apply a business rule to direct chat requests from my email address to that queue, and the test by sending chats from the website with my email address. 
This is a bad system because it requires testing to occur during chat hours - obviously we test the add-ins in sandboxes before we push to production, but there is a lot of site-specific configuration associated with the add-in, so updating during chat hours can cause downtime for it.