Antti - those look very interesting for 17 oz a pair it may be a great compromise.
Just got back from through fishing the JMT south to north and decided not to bring any additional footwear on my trip. I initially waded in my hiking shoes for the first 2 days. Soon developed serious raw region over achilles tendons that were very painful requiring significant taping. afterwards, I either waded in socks to the other side of the creek to improve my cast line (fly fishing) or just stayed on the edge and walked up or down stream until I found a clear casting lane. In retrospect, there were only a few creeks/rivers on which, wading shoes would have been really nice (Woods Creek, middle and north fork of the San Joaquin, Mono Creek and Merced River). However, when fishing those creeks and rivers, I simply used my socks alone or bare feet. Not ideal, at times a bit uncomfortable but nothing compared to my torn up heels. If I did it again, I'd probably bring a light 5 fingers or simple beach/sand shoe for protection. maybe even a thicker sock with a bit of shoe goo on the bottom, hmmm.