The yeild strength of hardox is 1000MPa, which is more than double a decent grade of mild steel.
In our practical tests, for penetrating 3mm Rhs we peaked at about 2 tonnes, and for 5mm wall peaked at about 5 tonnes.
If we assume about double penetration force for hardox? I have no idea how it would react once the leading edge of a spike/ beak is driven through.
For the spike we used EN36, as it was a good compromise between hardness and impact resistance.
It did pretty well and didnt dull too much.
In my opinion, on a feather weight hydraulics will not be effective once scaled down.
With our hydraulic system, we have taken a very long time sourcing a pump system which can provide our flowrate and pressure and be light enough. Wet it will weigh about 12.5kg and provide ~8 tonnes at the tip with 200mm stroke in 6 seconds.
I have not investigated smaller systems, but think the applications would be limited, so these may be hard to come across and expensive.
There are definatly other ways to get that much force, with gearing electric motors, lead screws, or levers and pneumatics for instance, but we certainly couldnt think of a viable way, and we tried pretty hard to stay away from hydraulics!
For a feather weight, the lead screw, like a car jack may be an idea