Thanks for taking the time to reply, Jeff (?).
That's a good point about Kawai being more focused on the home market, while the stage market has quite a lot of recent competition. However, unless they plan to abandon the stage market altogether, I would hope that they would see all this competition as a reason to update their own stage offerings. And I believe their stage models (MP series) are still seen as "the player's choice" due to their globally-recognised keybeds/actions.
Nord felt it was worth putting one of their actions in the Nord Grand, after all.
Thanks for the tip about the other forum - I might ask over there as well.
Will