Hi.

A mistake can ram the touche probe against the workpiece.
And seriously damage the touche probe.

What if you use a piece of plastic foam as workpiece ?
With aluminiumfoil around the foam.

Maybe first tape some gaffertape against the backside of the aluminiumfoil to make it a bit stronger.

If the touch probe or cutter then rams against the foam workpiece there is less chance of damage.

Vroemm.