The other workaround I can think of is to use Krita in VMPlayer(Fusion?) with Ubuntu. Sounds clunky but I'm doing that with the devel version of MyPaint . Wacom usb pass through on Virtualbox isn't working well.
Krita's just lacking a OSX build. I've been using the windows build for a while. Krita's focus is on digital painting. I would say Krita is more comparable to Corel's Painter instead of Photoshop.