Well of course the MIDI is no problem, but indeed I wanted to say the A90EX is very good, but you need to FEEL it.
This is the most useless question on this forum, cause the PIANO sound and the FEEL of the keys is too individual. Someone likes the pianos of Technics, someone of Roland etc. And all brands have different keys, so check them all out.

The technical side is NO problem. You will be able to do what you intended.

Ilija