For the spike, I usually just take a piece of corrugated cardboard, fold it to double the thickness, punch holes through it, and use some thin cord to tie it through the hole in the spike. This is low-tech and works if I lose my protector while traveling, which is what always happens. No matter where I am, it's always pretty easy to get some cardboard.
For the adze, duct tape works. In fact, I know people who climb with duct tape over the adze, on the theory that it will keep them from getting cut accidentally by the edge. You don't need the adze for self-arrest. If you need to cut hard ice or something, you can take off the duct tape (or the act of cutting might just take it off). The duct tape method also works for me when traveling, since I carry a small amount of duct tape anyway for use in taping toes, repairing ponchos, etc.