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I hadn't thought of that. I sometimes use the binocular clamp to hold a filter or polarizer. The difficulty of using a close-up lens would seem to be parallax. Haven't found the article, so maybe it's mentioned, but if one devised a rack to move the camera the distance between the viewfinder and lens it would work. Kind of like the one the Rollieflex marketed years ago.

As the moderator says, good agitation is important. That, to me, is one of the weak points of the Minox tank. I use the thermometer method and pump it continuously during development, rinse and fixing. As you have done, I make sure the tank is really full, adding a little liquid after agitating for 30 sec. or so. I had never heard of the eyedropper method, but, it sounds good too. In any case, continuous agitation is important. While the Minox tank is great for situations where you don't have access to a darkroom, I like my Nikor reels. They're not difficult to load, you can use more solution, and agitation is easier. Additionally, as I reload the cassettes, they don't have the felt light traps soaked by chemicals. Just my way of doing things. Unfortunately, the metal reels are very hard to find these days.