Having a 'degree' does not necessarily mean that you would be an 'engineer', unless it is one that qualifies and allows the use of the title.
I think that the title 'technologist' is an attempt to try and give an identity to the very wide range of technical jobs. It is also a move away from the 'technician' title which has come to mean something less than it used to.
Similarly, the clinical technology degree being mooted is aimed at standardising training and knowledge base for this group. It is being driven by the DH.
Hopefully this will increase the range of transferable skills and knowledge, making it easier to move around from one discipline to another.
As far as the cost of registration is concerned, this will be set by the HPC.