Mojave to Monterey upgrade hangs

My attempt to upgrade a 2019 MacBook Pro from macOS Mojave to macOS Monterey failed badly. After a little less than an hour a black screen with an Apple logo and a progress bar appeared as expected. When the progress bar reached about 90%, however, the process appeared to hang. The screen remained in this state for several hours, the machine heated up, and the fan came on.

A restart displayed a Mojave login screen, after which the system returned to the same state: black screen, Apple logo, and a 90% complete progress bar. The progress bar appeared to advanced to about 95%, but once again after several hours the machine became warm and the fan came on. A second restart produced the same results, as did booting into recovery mode and selecting the "Reinstall macOS Monterey" option.

The first attempt to boot from an external Carbon Copy Cloner backup failed due to the system's disk security settings. After booting into recovery mode once again and using the Startup Security Utility to allow booting from an external drive, the system successfully booted into Mojave from the backup drive.

The first attempt to restore the internal disk from the backup posed a bit of a quandary. Rather than seeing the usual "Macintosh HD" disk, Carbon Copy Cloner saw three potential target disks to which it could restore (Data, Install, and Preboot) that were created by the failed Monterey upgrade. Disk Utility made it possible to reformat the parent physical device as an APFS volume with GUID partitioning, and the Carbon Copy Cloner restore is currently underway. After that I'll find out if the system will boot successfully into Mojave from the internal drive as it did before this misadventure began. If it does, hats off to Bombich Software.

Any reason to assume a second upgrade attempt might succeed? Do I just have to bite the bullet, wipe the disk, and do a clean install of Monterey? Any suggestions welcome.