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ADV8005 without front end receiver for OSD display


My current architecture is HDMI source-->ADV7612 --> ADV8005 --> scaler,

When there is no input HDMI signal, I enable ADV7612 freerun for ADV8005 OSD display,

We have a question, the scaler IC can generate H sync, V sync, and DE signal.

If we only need OSD, no need input signal, we consider to remove ADV7612.

Is it possible use scaler H sync, V sync, and DE signal for ADV8005 reference clock so that ADV8005 can display OSD?

What signals are necessary for ADV8005 reference clock to display OSD (1080P OSD)?