I have a special interest in Luchesi because of his association with my hometown, Bonn. See the video description for more information about him. The Kdousov organ works very well with Italian music -- and it has two manuals, which makes it rather easier to alternate "forte" and "piano" sections as the score demands. The piece was written when Luchesi still lived in Italy, and there, in his day, organs with more than one manual were extremely rare. But we have the express statement that the young Beethoven deputised for Luchesi "on the organ" during Luchesi's absence from Bonn in 1784. So even as kapellmeister in Bonn Luchesi did still play the organ -- and in Bonn he would have had ready access to instruments with two or more manuals (thus Beethoven's organ at the Greyfriars' Church had three).