I did a little checking on Chaney Glaicer last night.
This image from the USGS shows the Chaney Glacier in 1911. You could just hike up from 50-Mtn CG and walk right onto the glacier. I suspect that the access to the top of Chaney Glaicer was similar when Edwards described the route.
This is the latest image from the USGS showing much of Chaney Glacier melted away. The rim of the cirque is also showing. The primary concern is access from the notch over the rim and onto Chaney Glacier. You could also hike up the ridge (left side of the image), and then come down and avoid the entire glacier.
This USGS image shows the image dimensions from the past to the present.
So, the real concern is the access over the rim onto the glacier. I contacted someone who went this route a couple years ago. He said the hardest part was the climb up from 50-Mtn CG to the notch. He didn't specify his route up to the notch. Didn't have a problem getting onto the glacier. But, you have to remember that this was a couple of years ago, so the access over the rim could have gotten more difficult over time.
I also checked around for a more current image of Chaney Glacier. Here is a Hi-res image on
summitpost of Chaney Glacier from Kipp. You can clearly see the rim poking up.
If you are really interested, you can always get up early, while camping at 50-Mtn CG, and hike up to the notch and determine the feasibility of the descent onto the Glacier. That would remove any unexpected issues with the route. At an absolute minimum, I would wear crampons. I wouldn't substitute with micropikes. An ice axe or something to self-arrest would be recommended. I would also do the route with at least another experienced hiker. I wouldn't bring someone inexperienced. I would then hike straight down, and turn north towards Sue Lake at the base of the tarn. You would have to also cross the run off from the tarn. At least, this would be my plan. You might come up with a different plan. I didn't look at the glacier with Google Earth, but I would recommend it.