I have to ask..
Why is an aircraft model-change such a big issue to the destination country ?
Wouldn't the destination airport get the ETA and aircraft-type from their ATCO ?,
who would already have the plan before departure ?
Sending an A380 to an airport that cannot handle it would be airline incompetance,
but destination processing (ATC/airport/immigration) a 787 should not be too disimilar to a A321.