Ignore hard and or softlimits for toolchange

My toolchange uses two custom hydraulic rams in top z position to release the tool.
They are leaking and I am not sure if I can fix them. An alternative would be to make them fixed and move Z up to release the tool. 
But this has to be avoided during normal usage.
The reference switch is at the end of the tool change travel. So I could use this as a combined end and reference switch.
But I would need to be able to move over this point for toolchange. 
Is ip possible to set something like this up?

Thanks Patrick

Thanks that already helped a lot.
linking and unlinking Hal I can mange in a bash script.
I would switch reference and limit switch for toolchenge and Bach afterwards.
What I don't understand is the queuebuster command.
What I understand ist the the limits are part of the milltask an I can alter the values with halcmd without altering the infile.
Where and how do I need the queuebuster?

Thanks

Patrick

Many thanks! this sounds way easier than I tought.