waveguide for xt25 for crossing at 1 khz

I am working on a build from a slavaging a 22liter slanted baffle speaker cabinet, with driver xt25 and mw19p (or mw19tx)

I know this build is done to death and can reference troel‘s desgin however I want to spice it up having crossover frequency at around 1khz, to minimize the woofer directivty problem so the tweeter needs a waveguide. does any onknow the smallest waveguide i could use ? i am hopping something like a 4 inch waveguide or an elliptcal wavrguide to modify the exisiting 3 inch dome opening in the cabinet
 
I agree on the give up but this is the reason of mounting it with waveguide to boost frequency at 1khz region even it is 1.5khz

Well I’ve searched a bunch of thread relating 25xt and wave guide there are user had put it into an 8 inch waveguide to cross it at 800hz it did not say whether dsp was used or not.
 
For 1kHz I might use a 50cm waveguide, but that's not important.

When you cross to a waveguide, you want to keep the woofer directivity. You should cross a 7.5" driver somewhere closer to 2kHz. 1kHz is too low for the woofer.