NSTALN 10+ year member
Dismember
If you have the room for a 4 inch and space to provide proper enclosure then there a quite a few options...The AF 2.5's are for those who want extension and have limited space, hence the size and tiny volume required. I can vouch for their ability to extend low and sound amazing...I've never used a driver so capable in that size. Morel just released a small diameter midrange:if i can find something strong down to 500 id do that. honestly ive never done a 3way. but the more i think about it the more i want a 4" crossed low like 400 or so.
https://www.morelhifi.com/product/ccwr254/
May be worth looking into.