I am sorry you did not get any more replies. The DIY forum is not visited as much as I would like. You might ask this question at Randy's forum page
https://www.decware.com/cgi-bin/yabb22/YaBB.pl?board=randyOne thought I did have is what Randy calls Betsy & Buck where you use the 8" speaker you like best, and add to it on the same open baffle a 12" speaker to play the bass. I believe that is what I would do.
I do not remember how to get to the picture of it on Randy's web site, but the 8 and 12 are mounted diagonally to each other.
I hope this helps, Brian