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TL431LI: Is it aviliabile for placing a Diode between pin REF and cathode? Urgent!

Part Number: TL431LI
Other Parts Discussed in Thread: TL431,

Hi experts,

As shown in the picture below, my customer wants to reliaze stable voltage through placing a diode between pin REF and pin cathode.

On TL431's right is power input, certainly, there is a resistance is seriesed with power input, but not shows in the picture. My question is if there is a dioed leakage current >0.4uA(refer to Iref through D1), whether the circuit will achieve normal work?  And how to selecet the appropriate D1? 

By the way, D1 uses to prevent the reverse current from output.