In relation to Martin Baker ejection seats in particular, I think the company gave notice, in around 2018, that it wouldn’t be providing spares support for ‘historical’ seats. As I recall, that caused some complexity for the Sabre operated by Temora Aviation Museum. TAM had spares for the seats in the Meteor (or was it Vampire?). These may have been among the complexities that resulted in it all being eventually moved into 100SQN RAAF. But I have no first-hand knowledge of the details of the circumstances.
As far as I am aware, no passengers were carried in ejection seat fitted aircraft while they were being operated by TAM (assuming the aircraft had the capacity).