Transcriptions do seem to be becoming "respectable" again, and I think this is a good thing. It's great to hear some of this less often played Liszt repertoire coming out, as an alternative to the usual warhorses.
I think you've coped well with the technical demands of this piece, and I don't mind your alternative ending at all. On the whole it's colourful and exciting to listen to. However, for my taste you haven't completely captured the bel canto aspect of the Italian operatic style. It needs a little more rubato, and more attention to the melodic line without letting the (admittedly very interesting) accompanying figures take over. For instance, I'm sure that any operatic baritone would linger slightly over the triplet at 44 seconds, and would make a much bigger deal over the marcato
(which in romantic opera implies slowing down) and pause at 58-60 seconds. There are many more such details throughout the piece.
By the way, if you check the original aria (which nowadays is easy to do via YouTube, no need to leave the house and go to the library!) you'll find that in the first full bar of the main melody (at 35 seconds in your recording), the low C for the right hand on beat 2 is in fact part of the melodic line.
The episode from 3:12 to 3:45 sounds beautifully laid back and is for me the most convincingly "Italian" part of the performance. (But then with the LH octaves you get too absorbed in the accompaniment again!)
Don't mind me being so fussy over details, I did enjoy listening to this performance. I hope you post some more of these transcriptions! How about the waltz from Faust