I have been absolutely loving wearing these in colder, drier weather. Its an extremely minimal shoe- feels like being barefoot, They are too warm for warmer weather and they absorb water is wet weather. I dealt with wet weather by using sealskinz waterproof socks. I bought two sizes: a smaller size for just my foot and a bigger size to accommodate socks.
Same principle, but with single toes.
And then there are them:
So far I have used none of them, but different Five Finger shoes extensivly. I can recommend the general principle much, if you enjoy barefeet running, but not cutting your feet open.
I can also recommend Vibram five finger shoes for swimming where there are rocks or sharp shells or corals. They basically work like wetsuit feet with a great grip - and helps avoiding falls and cuts. Works both for summer and winter in my experience.
Ed: or just for wading/ crossing streams.
Sometimes in fact, 2 toes get into one, but it is actually not too uncomfortable, so maybe it would still work for you? There are many different models, some would probably be better suited as they are more flexible and wider, but I have no idea about the current models.
I am aware that climbing shoes are designed to be stiff to give you support, but I'm wondering if I can strengthen my feet enough and use something like this?