The operative phrase is 'cost effective'. I've visited this topic before, at work. It seems to be a good idea to have a dedicated 'lift team'. But, it won't happen simply because you need extra, dedicated bodies to do this (unless you had some other idea in mind on how to deploy the aides).
I always thought that a team of people (2), that could be called to assist in lifts, anywhere in a facility, was a great idea. The team would be called to do all 2-person lifts.