One thing I did that worked well and got ppl engaged in talking and thinking about testing in this way was to organise a round table as part of a company meet-up.
Each person around the table was given a card with an explorer personality on it - Tom Crean, Emilia Eirheart, Matthew Henson etc. They were then assigned an associated testing personality “type” based on their explorer card. So we had a lone shark techie, a collaborative empathic tester, a social “talk a lot” tester and an analytical “modelling” tester.
We had a senior tester who explained what a charter and helped the new testers to come up with their perspective on testing. They were also there to nudge the team on and try to quell the volume of chatter and laughter!
We had an internally developed app which they all executed their test charter against once they had spent some time discussing it in the context of their personality types.
As a springboard for engagement and conversation it worked really well it “adjusted” the perception held by some of the business that exploratory testing was just making it up or winging it.
Having started small and seeing that this worked in terms of a friendly immediate team, it would be something I would happily take to a client site as a learning exercise to see if the idea scaled.