It is not harder to teach an instructor to teach neutrally buoyant than to have them teach on the knees. It would have zero impact on that issue.
The problem is identical to the one I faced as a school district staff developer--the powers want the change, but they think that it can be done progressively, a little at a time, without pissing off the veterans. If you do a lot of reading in theories about making effective change, you will see that this is very common, but wrong, thinking on the part of management.