Do you have access to sand bells? Although it’s not “new,” sometimes it’s a nice variety to mix up regular kettlebell exercises with sandbells. The grip and balance are a bit different.
Sometimes, I’ll start with a heavy kettlebell exercise (where “heavy” is defined by and relative to the client) to pre-fatigue, then move to the same exercise with a sand bell as a finisher.
Another thing I like to do is alternate between kettlebell swings where the momentum is mostly upwards and sand bell slam + squats where the momentum is mostly downwards.