Hi Mike,
I went down this route but as my set up is a little peculiar because I'm using an adapted Ford Bellhousing and large Ford clutch components rather than the smaller Porsche clutch, I don't have enough space to fit a hydraulic release bearing. As a result I will be adapting back to the mechanical release arm and slave cylinder set up, all be it a modified version. I did however purchase a low profile hydraulic clutch release bearing that fits a Porsche 930 box that I no longer require. It's a Tillton unit. All you need is one of these bearings and a hydraulic line to the slave cylinder. If you need photos of the bearing and or measurements of it, let me know.
Martin