Switching feet/meters#1595

If I start a flight in europe and go to China, the whole filght will be handeled in “western” flight levels (330, 350, 370) even in chinese airspace.
On the way back the whole flight will stay on “Chinese” flight leves (321, 341,…) even in european airspace. It would be great if these could change when entering/leaving metric airspace.
Even greater would be actual metric flight levels :)