A dome tweeter to a very shallow "horn like" high frequency "director"

I realize this is not one of JBL's efforts, but this forum is my best prospect for this sort of thing

EV not responding; I've emailed them thrice about diaphragms and re-cone kits, no reply. Don't feel like playing "let me connect you" with 'em since they've changed hands

You can see the foam in this shot, it's turned brown from rot

Want to avoid disassembling driver until I have something in hand; my rotted foam is still intact, better than nothing for now. Appears to be approximately 1/4" thick. Rick Cobb came through with the edges I needed. Any help/ideas would be well received

Thank you