Disable only one jog direction

Our system is KRC4 8.5.7 HF1 and KR 90 R3100 extra HA.
If axis 2 is in a certain axis range, and axis 1 is moved towards a certain axis range, the servomotors that are mounted on axis2-3 could colliede with an obstacle.
When an operator jogs the robot and is not carefull for the obstacle he could make a collision. If axis 1 comes in a specific axis range I should want to inhibit the jogging of axis 1 in that direction. The direction away from the obstacle should still be possible. The inhibit also should only be necesecary if axis 2 is in a specific axis range. Is there a way to accomplish this on the robot?

I did the configuration with the axis workspaces (setup ranges for axis 1 and 2) and this stops the robot just before the obstacle.
The operator has then to overrule the workspace monitoring to jog the robot away from the obstacle.
However if the operator mistakes he can jog the robot towards the obstacle and hit it.
If it is not possible to block the direction towards the obstacle when jogging, an alternative would be to reduce the jog velocity (from the program) if the robot is in the prohibited axis workspace. But I did not find a variable to reduce the jog velocity.
I do have safeopertion (v3.4.6), maybe activating reduced velocity monitoring from the safety plc is my last chance?

The only variable I found was $keymove.T1.
But this variable becomes high both for positive and negative jogging of axis 1, I should want to know f.i. if the operator jogs axis 1 in negative direction.