I'm writing a Piano Sonata in A-flat in the Classical Era style, and I'm working on the development section right now, which has always been a struggle of mine. I started in B-flat, briefly went to B-flat minor, then back to B-flat (I do a lot of modal modulations), then went to G (via the swift progression of B dim, C, C# dim, D, and then G). I then am going to perform another modal modulation to G minor so I can move back to the relative major of B-flat and work my way back to the home key. Now obviously there isn't a more distant key to A-flat than G, so there are A LOT of accidentals used. And I know there weren't too many instances in the Classical Era where there were this distant of a modulations, but in instances like this should I use an actual change of key signature in the middle of the piece? I've just never seen Mozart or Haydn do this before. And of course I might even go back and stop the modulation at C major then go to C minor, instead of going to G then G minor, but did Classical Era do this in the middle of a development section? Thanks in advance.