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.
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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.