Here’s the classic solution:
Pressing/holding the control + command keys then left mouse button.
Once you are into orbit mode, you don’t have to hold the modifier keys down.
You might try this free, third-party tool.
https://discussions.apple.com/thread/3051193?tstart=0
I have not tried it and I would love to hear about anyone’s experience with it because keyboard+mouse combinations feel awkward to me.