A very broad question!

Who would you want to train and what training would you want to give them?

Do you want to train undergraduates in the principles of health and safety management, apprentices in how to change abrasive wheels or water engineers on how to use breathing apparatus to enter confined spaces and/or to rescue people from same etc etc etc?

Not sure if you already have a qualification in 'Train the trainer' it will give an idea on how to present courses: https://www.cityandguilds.com/qualifications-and-apprenticeships/learning/training-and-development/7300-introduction-to-trainer-skills#&acc=level2

CSCS  you will most likely be better providing citb courses like H&S Awareness, SSSTS, SMSTS... we use the ECS and thats a revision booklet with multi choice answers. We can now do remote invigilating so the employees have no need to attend a test centre (go COVID!) i affectionaly call it 'the idiot test' becuase if you fail... well!! Its so very basic for H&S introduction

Perhaps another idea is to go to another training provider and maybe volunteer to assist with lessons. They can then provide feedback on your tutoring type?

When i did my NEBOSH i 'think' Phoenix H&S said they were supporting someone in a similar vein - just a thought :)