Why not just simplify things.
When you call delivery tell them you are unable 3000' at ORD 5 DME. (Just like the jepp plate says.) This is what a major local airline does (United).
ORD ATC is well aware that a heavy B744 etc. probably won't meet the restriction.
UA accelerates at 800' AGL with CLB thrust at flaps 5. At MTOW on the B744 they will definitely not meet 3000' or above at ORD 5 DME.
LH on the other hand simply accelerates at 3000' with thrust reduction at 1500' on the B744 out of ORD. Of course they never go out anywhere near MTOW on a ORD-FRA flight.