You can run windows in bootcamp. I think you can get a free copy of Windows 10 (legally), it just won't let you do everything but you should be able to run VCDS.
I ran windows 7 in bootcamp for a while but I have an old 15" Macbook Pro and got tired of lugging that with me to the car. So I bought a Lenovo Idealpad 100s laptop that's small I don't care about. It was on sale at the time for about $129 and works great for what it is.