After moving from macOS to a Linux-based distribution, I benefit from deciding to have most of my backups on HFS+ partitions (with journaling disabled using a program that changes the value of kHFSVolumeJournaledBit later) early on during system configuration.
Unfortunately, I still decided to use some of my back drives as APFS and it contains two volumes. They (as of now) are not manipulable in GParted and I need to shrink the drive as I need to migrate data off a drive. This is all done on a Linux system as I no longer have the privilege of using a macOS system.
My first thought would be to convert it to HFS+, conversion clearly being possible due to the existence of Paragon's APFS to HFS+ Converter (which as of this writing is no longer available for download) and the fact that I don't think deduplication would have affected my files too much so space occupied shouldn't be too different.
I was considering running Paragon's tool within Darling but running alpha-level software to manipulate my (sole) backup is not on the top of my list and as far as I know, the converter does not have a CLI-only interface.
That being said, is there a (better) way to convert an APFS drive to an HFS+ (non Journaled) partition on Linux?