VOLUME & SPEAKER ALTERNATIVES FOR BLINDER

I'm using a Valentine1 and have the blider m20 on my Ducati st3.
I use a open face hlemet so it's hard to hear hence
I have hooked up the valentine to the radar screamer which works well and would like to do the same with the blinder. it's loud but not loud enough when on the freeway, plus the little light is pretty dim during the day.
Is there someting that can be done or does something exist that I can hook up the blinder to a alternate sound amplifying source for better volume?
Is it possible to tap into the wiring of the blinder and attach it to the screamer?
any suggestion or ideas would be helpful
thanks
JC