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Wow what an experience you have had with this. I was able to fit my SEAS 27 soft dome tweeters in the factory location with the single screw, just needed a little bit of tweaking to the SEAS grill for the factory grill to fit. The previous owners had installed some Sony tweeters that fit without any modifications. You should be able to fit whatever you have in the original spot and keep the grills.
I am using the Kicker 46CSS654 for the doors, per Crutchfield there is some modification needed for the tweeters, not sure how much.
Kicker 46CSS654
These tweeters look pretty compact. I'll have to open the box to see if the grills are removable but I imagine they would be like they were for the Kicker speakers I put in the rear deck.