I have had morphine both IV and oral. The first time I had it IV was in the hospital, and the rush caught me off-guard so I was a bit worried. The nurse had just added an anti-nausea medicine, an anti-inflammatory drug, and the morphine, all consecutively into the IV line, so when the rush hit me after she had walked away, I thought it was a bad reaction I was having. Anyway, since I realized that I had just experienced the morphine rush, I asked for another shot later on when the Dr asked me if I needed more. This time I was prepared since I knew that what I was about to feel was not some fatal reaction to the cocktail they IVd me with the previous time. The oral high is the same as the IV high, minus the 20 second rush and being able to use a lesser amount when IVing compared to an oral dose, but that goes for pretty much any drug.
I think that you should take the morphine orally, because for all you know you may not like the drug, so I don't see a reason for diving in head first like that. If you have some liquid morphine ampules from the hospital then I would say it is worth it, but shooting pills is not worth it. Pills already have a large amount of fillers/binders, and now throw in the gelling stuff (assuming the kind you get gels up) and it makes it even more dangerous.
If you end up doing this though, use a micron filter, or at least cotton filter it multiple times.