Does a bigger recess affect the sound?

I am currently building a pair of speakers where the diameter of the woofer is 177 mm (6,97 inches) and the thickness is 4mm (0,16 inches).
At some point in the future, I will probably upgrade to an other driver with a diamenter of 183 mm (7,20 inches) and a thickness of 6 mm (0,24) inches.

Since I know about the upgrade already, I am planning to make the big (183 & 6mm) recess from the start. To make the smaller driver flush with the baffle and look better, I am going to 3D print an "adaptor" that takes up the remaining space in the diameter and depth.

Would the above plan be likely to affect the sound? Or is it a reasonable plan?
Sorry for the probably stupid question, but I'm not sure whether flush mounting is only about aesthetics or whether it affects the sound.


Thanks already
 
It seems a reasonable decision to me. So basically you will have a 3mm 3D printed ring flush with the smaller driver when the packing piece and driver are mounted ?

I guess the 4 or 6 driver mounting holes and the pressure from the driver frame will stop the adaptor from vibrating,
 
I was planning to print something like this. I usually dont use gaskets for mounting the drivers..

RING.png
 
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