Tweeters with Low crossover frequency

Hello,

I have a Audax stock, used to have my own waveguide but couldn't reuse it so I bought monacor wg I will need to custom fit.
Anyway I don't intend to tweak the tweeter itself by drilling holes and so on so I would like to try another one that could be cut at 1.5 khz with high slope. Digital filtering used.
I wonder, try a tw030wa12 or bliesma very expensive one...ahah don't tell my wife...