I don't have an Echo Spot, but I do have an Echo Show, and I noticed that whenever I play a TTS announcement to it via Echo Speaks, it also displays the text on the screen. This was with "Announce All," not a device-specific "announce" or "speak" command, so I'm not sure if those will do the same thing (also didn't notice this when I used Alexa TTS, but I didn't use that integration as much). I'm also not sure you get the text without the speech, which I suppose if you're trying to not wake someone up might be bad. 
I was going to suggest a button you could press that disables the automation, but it sounds like you already have one. Are you concerned that it's not working? Maybe there's another issue there that could be fixed, or maybe you could make the button turn the lights on to something like red at 1% that is unlikely to wake someone up if it's in a closet and not the full room (and you'll see ahead of time that it works)...just thinking of other ideas here.