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 once transferred all 20MB of a Mac Plus hard drive, an author’s lifetime work, to a new iMac with this method.
I like to imagine the author finally hit the limit of the 20MB hard drive, then decided, "you know what, rather than put 2 spaces after periods, I'll replace them all with a single space like the kids do", saving 400KB, and making room for at least a couple more weeks of work while shopping for a new computer.