Still no chance. In fact, there would be even less chance on the Z/28 vs the other versions. There are massive structural members right above the door. Remove them (for T-tops) and you compromise the strength of the car & need to reinforce things in order to keep the it safe in a crash, as well as maintaining a stiff chassis for better handling. Re-working the underlying structure would require a massive investment & result in a heavier car.
Note, if I've gotten any facts wrong in the above, just ignore any points I made with them
don't believe a thing you read about the next gen Camaro -- as history has proven time and time again:
WE DO NOT TALK ABOUT FUTURE PRODUCT PLANS PERIOD FbodFather
Camaro5 Fest sub-forum