The safest way to change a havalon blade is with pliers, Leatherman or otherwise. I have used one for near 20 years now. Also use a fixed blade buck knife for anything that will require a lot of pressure.
I have no problem with either. You should be able to sharpen things. It is a basic skill like changing a tire on the side of the road. Look at how it is designed to cut and restore it. Knives, scissors, router bits, drill bits, lathe tools, chisels, whatever. I am all for instant and disposable for saving time for more important things, but we shouldn't short ourselves the acquisition of the skills to do it the hard way.