Hello Yip & Jimmy
I work for a lift company and would suggest you find out from the strata manager which lift company services your lifts and find out when the next service is due. Most lifts get serviced quarterly, and these days a service report is issued each time. This report probably goes to the strata manager.
Then contact the lift company and ask if they can alter the programming at the next service or, if that’s not possible, ask them to quote on the works required. The lift company will know more about lifts than the EC!
That way at least you have a quoted figure to present to the EC. The lift company should also be able to give you a nice professional looking document highlighting all the benefits this upgrade will provide.
good luck