Maybe a blanket statement that trainings are offered at least yearly on PloneConf, and in between based on expressed interest, with a [get in touch] action to be clued in on upcoming trainings that may be in the process of planning, without actually being published yet. Which is where we currently are.
Offering paid mentorship packages on top of free online training materials might be a way to increase reach without needing much in the way of meatspace logistics. Even if you have a training video and the full syllabus there's a need for dialogue, and a dedicated personal mentor may be less scary than getting ignored (or flamed) on a public community forum.