Finding an export options for instance export of a variable

You can run Windows in a virtual machine. That is very handy as you can have as many machines as you like (or fit on your disk). I have an external SSD full of virtual machines with different versions of macOS and Windows.

1 Like

Since testing was mentioned, I did my favourite form of testing: waiting for a client to report a bug. Adding the empty fvar leads to faulty PDF export when using the TTFs in InDesign on macOS.

And it works if there is no fvar table?

Yes.