Thank you. Here those pliers are common up to 6 mm steel cable size and then whole lot bigger hydraulic ones.
I think that gauge diameter is close to 18 mm with the 8 mm ferrules I have. If I read the tables right I need 30 metric tons to press the dies.
There must be something (like hydraulic swage) in German e-bay. I'll trawl in the evening, after I get home.
This looks interesting:
Maybe something like this:
I wish I had the dimenssions for the critical parts, therefore I asked.