Thank you William for the tip on using a heat gun, but I believe that I would still have the problem of getting the grease to make it to the top bearing or bushing because of it coming out the bottom of the shaft. Looking at the diagram you attached, it appears the the top mount is a sealed...
I am having the same problem with my 2007 DF90. I removed the one and only grease fitting and flushed the steering column with penetrating fluid to dissolve the old hard grease, could not get the fluid to run out of the top of the column because it all kept blowing out the bottom of the shaft...