Have you already thought about using iPad Pro as an alternative to a pricey Wacom tablet? Solomon Jagwe has shared another example of working in ZBrush on the iPad Pro, with Tablet Pro and Duet Display, that shows the potential of the tablet.
In this video I show how you can use Zbrush on the iPad Pro, with Tablet Pro and Duet Display to achieve the common commands that require Keyboard shortcuts like Shift, Ctrl, etc.
Solomon Jagwe
Make sure to discuss you experience in the comments below.