Thanks everybody. I spoke with EECO and they will build the sleeve.
JKH
95
no
21 years
removing wires and buttons, moving terminal and finals down
There will be no access(locked service access door) to the current 6th floor.
Code requires a mechanical stop at the top floor. I assume in case of entrapment, and the electrical stops fail to prevent the car from continuing to run. It could be difficult to free the entrapped passengers.