What about something right in between the OM and D body sizes?
A HJ-41/42?
Have a look at Martin J-14 specs.
They call it a jumbo but it's actually a 0000 body with 4 7/8" dred body depth.
Here's a picture of my Martin JDP2 which has the J-14 body and unusually, a slot-head.
Comfortable.
Plenty of depth for tone.
Handles all playing styles with ease.
And this is the rather rare HJ-28