You could do that.. I just really like mine with 7-8 holes punched with the dynamat, but I do think it would be a bit bloaty without it.
I had a theory about why a full liberation sounds better. I think it has more to do with the plastic being removed from the front of the driver than the driver "reacting" with the wood better due to there being lass plastic. I'm not sure if this was brought up but to me removing the material in front of the driver that is blocking sound would have more of an impact than the removal of plastic from the sides. Any thoughts on this? Because if my theory is correct you shouldn't have to do a full liberation you would just need to cut some of the plastic off that is in front of the driver, which may or may not be easier.
Big Bill has done this, the then removed even more material from the backs of the drivers too. I'm pretty sure he was happy with the results.
+1.. I'd pick up a pair of iGrado's if i need a driver.