Bridge the gap with horizontal catchfencing, designed to hold the car as it drops down, not stressed for high energy impacts?
This would be cheaper/easier to install than the vertical stuff, possibly/preferably using the existing hard points in the catch fencing and the tyre wall. That wouldn't do much for safe movement of marshals, but the only alternative for that is to widen the gap by moving either/both the tyre wall and catchfence.
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