Use any other kind of PC with an expansion bus to dump the blocks to a modern block device, then attach that to the Mac.
I used to be an Apple service technician. We kept an old mac that had SCSI in an expansion port and Ethernet in another for precisely this reason.
I once transferred all 20MB of a Mac Plus hard drive, an author’s lifetime work, to a new iMac with this method.
That is unfortunately the likely fallback... It just feels so wasteful and inelegant.
I used to be an Apple service technician. We kept an old mac that had SCSI in an expansion port and Ethernet in another for precisely this reason.
I once transferred all 20MB of a Mac Plus hard drive, an author’s lifetime work, to a new iMac with this method.