I have made some progress..
I made a box out of wood to hold the mounting bolt flange in place, and used a bottlejack to push from the other end.
Drilled and tapped a hydraulic coupling to M8. Used a threaded M8 rod and turned one side (7-8mm) of the rod to M4. That is the oil injector hole size. And then drilled a 2mm hole trough the entire rod.
I used a cheap 4ton manual hydraulic pump as the oil injector pump.
Here is the sleeve where I injected hydraulic oil. The manual recommends a oil with viscosity of 350ES (46 E Degree) I used what came with the pump (ISO32 I think)
I used a piece of pipe to fit over the draw bar.
I pumped the bottlejack a couple of times to hold the entire thing in place, and then pumped quite hard on the hydraulic injector pump. Applied a little bit of heat on the sleeve (30-40Celsius), and then pumped some more on the bottlejack. It was pretty easy to be honest, not much force needed when you load up the sleeve with oil. When the sleeve released, it sprayed hydraulic oil all over the place, so make sure to wear eye protection, thick gloves and clothes just in case anything on the hydraulic side decides to go boom.
Here is a mockup without the injector pump connected.
I have ordered new bearings, so I have to figure out a safe way to get them back on...