Go with a bad *** 8" midbass and a wideband driver.
I've heard good things about the Stevens Audio MB-8 and pair it up with something like the Audible Physics Ram 3A...
https://www.slaacoustics.com/collections/frontpage/products/ram-3-a-miniature-wideband-loudspeaker-pair
As long as you can mount the wideband fairly on axis you should be good. The mentioned SI tweeters should be able to play low enough to meet up with an 8 also. Those things play surprisingly low.
I've heard good things about the Stevens Audio MB-8 and pair it up with something like the Audible Physics Ram 3A...
https://www.slaacoustics.com/collections/frontpage/products/ram-3-a-miniature-wideband-loudspeaker-pair
As long as you can mount the wideband fairly on axis you should be good. The mentioned SI tweeters should be able to play low enough to meet up with an 8 also. Those things play surprisingly low.