The trainer shortage is a design problem

And the design decisions are made elsewhere.

The difficulty of finding qualified, current trainers is discussed as a labour market condition. It is substantially a consequence of decisions about pay relative to industry, employment security, whether non-contact work is paid, and whether the provider funds the currency the framework requires.

Each of those decisions is made for defensible commercial reasons and their aggregate effect is a role that a competent practitioner will take only briefly or for non-financial reasons. The shortage is the predictable output.

The providers with the least difficulty are generally those who made different choices on two or three of those variables, which is observable and rarely examined by the ones reporting difficulty.

There is also a pipeline question nobody owns. The people who will teach in ten years are currently working in industry and have no route into training that anybody is maintaining, and providers compete for the existing pool rather than adding to it.

Arrangements where a practitioner teaches one day a week while continuing in the field solve several problems at once, including currency, and they are administratively awkward, which is why they are rare rather than because they do not work.