Removing the frame and LCD from the front bezel presented a problem. The frame was held down by small plastic fasteners that protruded through holes in the frame, and were topped with small plastic rings. It seems that there is no way to remove the frame without snapping off the small rings.

As user Mark H. points out in the comments, this is a manufacturing procedure called heat staking.

Luckily, there are other clips and adhesive on the frame, so it should all hold together fine when we reassemble the device.

Some heavy prying with a spudger frees the front glass from the display bezel, confirming that the front glass and digitizer can be replaced.