I changed tires for over 35yrs myself on the floor with tire irons. The super tenere is super easy to change tires on. Really a tire changer is not needed, but nice to have. For 2 or 3yrs now I've played around making my own, doing improvements, seeing what works and doesn't, modifying things here and there, and I think I got it. I have however looked at all tire changers and gained ideas, and learned a bit. Of course the Coats 220 is the benchmark by which all other changers try to duplicate. The Coats is about a $1500 item, so the Nomar is not "expensive", it's actually pretty reasonable depending on model chosen. The Cycle Hill, the lower priced one looks pretty good, the Classic I think they call it looks real good. The pro model looks great and still way less than $1500. The problem with the Nomar is the lever is not great. You can buy the coats 220 lever with the protectors, but it leaves a little to be desired as well. Trust me whatever changer you get, throw out the bar and buy a Mojolever. Works great. As to Harbor Freight, that may work, but need the Mojo blocks to keep from scratching as well as the Mojolever.
I made my own changer really out of necessity for the GL1800. Replacing the rear radial is near impossible, and after going to a runflat car tire completely impossible without some form of changer. For a Super Tenere as I said, not really needed. Look at Nomar site for several videos showing how they change tires.All those videos contain some real nice info that can be used regardless of what changer you have or even if you change on the floor with spoons.
If I was going to buy a changer I think I would go Nomar, either the newest Cycle Hill, or the classic, but also the Mojolever.