Two tone detect will absolutely detect "alert tones" including "warble tones" though that is not its intended purpose. Use Audacity to find the frequencies... and "spacing". You can fiddle with the durations and gap settings in TTD and it will work. I do it all the time on local channels. I have attached an example. The settings for this detect are ATone=349Hz, Duration .3, BTone=349Hz, Duration .3. Works like a champ.
I have also detected warbles, I think they are 1200/1000 around here. Same basic idea