Is there a way to retrieve an effect's bpm via OSC?

this could be an idea I don't have any Lighting bars to strobe right now for you make strobe fx and change the Attributes 
then make is as a Macro 

syntax to create the macro 
 
alt + L 
M 1 

Learning Macro 1 

chan 1 t 10 at full enter 
alt + e Effect 1 enter 

alt + L to stop learning Macro 

2) go to Fader Config 

add the macro of the BPM Sync so when you move the fader up the submaster is active then trigger the macro to create the strobe 

3) warning tho you need to make another macro of the same effect but with the strobe off to stop THIS!!!!

or it will keep strobing 
potentially could do 1 thru 10 @ effect enter to stop also not sure I never tested that
I always build my subs with macros on and off to keep it handy for busking so I hope this helps

please get back to me with your results I'm curious about your creations my friend 

No, there currently isn't. The information you can get is the reply to /eos/get/fx/900, and it doesn't include the BPM.