The problem with the Appletalk to Ethernet adapter is that would definitely need drivers that are unlikely to exist on the Mac.
Given that, then using the serial port with a dumb terminal would be the next best option, but IIRC MacOS didn't ship with a terminal application so there's a bit of a chicken and egg problem.
What might exist is an Appletalk implementation for the GPIO ports on a Raspberry Pi or similar board, which would let you use the built-in Appletalk file sharing to get stuff on and off of the machine. The retrocomputing scene has to have something like that, it would be extremely useful.
The problem with the Appletalk to Ethernet adapter is that would definitely need drivers that are unlikely to exist on the Mac.
Given that, then using the serial port with a dumb terminal would be the next best option, but IIRC MacOS didn't ship with a terminal application so there's a bit of a chicken and egg problem.
What might exist is an Appletalk implementation for the GPIO ports on a Raspberry Pi or similar board, which would let you use the built-in Appletalk file sharing to get stuff on and off of the machine. The retrocomputing scene has to have something like that, it would be extremely useful.