Yes, the trouble with honing is it takes many good laps to get an improvement, but only one bad move to make the blade worse. If you only have a finishing stone and you mess it up you will have to send the razor off.

Stick to just stropping as long as you can.

I suggest before you buy a single hone you plan ahead. Decide if you are ever going to restore old blades, or do your own repairs if you ding your own. Work out what range of hones you need, and choose a complete set that will keep you happy. If you don't, you will end up buying one stone after another, always looking for something better/different.

For this reason, you might want to look at the Shapton glass range. That 16K plate seems pretty special. You could get other Shaptons later on to cover any other grit you need and know you have a sensible set without any overlap or duplication.

But if all you want to do personally is refresh your blade every now and again, something like a Swaty barber hone should do the job. Alternatively one of the 12K stones or the Naniwa you mentioned.

Whatever hone you get, you really need something to lap it with. One of the DMT 8XX / 8X / 8C plates will do.