Ralf:
Your gear operates at 1000 psi. PLEASE don't try any shortcuts. Take my word, those props are expensive.
If your hydraulic pressure releases the downlocks, the wheels will try to move. Someone could easily get hurt
If you don't have the proper jacking equipment, cant you borrow jacks from a neighbor or maybe from the FBO.
Maybe someone on the LML is close enough to let you borrow theirs. Good Luck
Bill Hogarty