Are there any other options for ways to knead dough? Maybe some manual tools that make it easier?
If you have a food processor, you can use that but it should be at least an 11-cup model. You can also use a bread maker if you have one, using just the dough cycle. One of our members, turbosundance, even modified an old bread maker to use strictly for kneading dough, as he noted here: http://www.pizzamaking.com/forum/index.php/topic,576.msg37092.html#msg37092
(Reply 566). If you have an electric hand mixer you can use it for the early mixing stages of preparing high-hydration doughs and use your hands the rest of the way, as I described here: http://www.pizzamaking.com/forum/index.php/topic,3985.msg36489.html#msg36489
Many members have purchased refurbished machines, from eBay, Amazon.com and others, at considerably less than normal retail prices. You might even look for used equipment. You might also give strong hints to family members on what you would like for your birthday or for Xmas. If you settle on a stand mixer, I would look for one with a spiral hook, not a C-hook, which is far less effective for kneading dough.
If you find yourself having to continue to hand knead doughs, I suggest that you use one or more rest periods during the kneading of your doughs. That softens the dough and makes hand kneading easier, even for doughs using high-gluten flour. Of course, the doughs have to have a relatively high hydration, which rules out doughs used to make cracker style doughs and other low-hydration doughs.
If you continue to hand knead doughs, I suggest that you use a large, solid wooden spoon (not a dinky one) to do the mixing, and a good-sized mixing bowl. You should also have a bench knife to move the dough around on your work surface, and a long handled flexible plastic spatula (like the one shown in the photo at Reply 1 at http://www.pizzamaking.com/forum/index.php/topic,3985.msg33252.html#msg33252
) to scrape down the sides of your bowl. As between using the bowl method and the work surface method, I think the bowl method is easier (which is why I recommend that the bowl be of good size).
I have run out of ideas. Good luck.