I've had a brief look on Google and there are a number of postgraduate courses available.
totally useless for active caring, of course, so we can forget those. I certainly wouldn't be able to qualify to join the courses [for example at Universities of Bradford and Stirling] and they appear to be pitched at a distance from those with dementia.
I'll send you a Private Message with the details of the company that runs the home my wife is in. They have training for all staff and really impress me. they may buy in the training, in which case it might be available more widely.