Fantastic, thanks for taking the time to read through my post. ^^ Oh and well done on arranging it all by ear, I'm just a lazy one who looks for "an easy way out" wherever possible, haha. Sure no problem, those MIDIs should be easy to find if you'll ever need them.
In reply to your concerns, the moving melody line between the hands might require some cross-staffing (you can Google the instructions on how to do that in Finale, it's called the "Note Mover Tool") and/or add a dashed line, like you said.
I'll let you experiment with those options, that should hopefully make it easier for the performer to read the sheets.
I still think that m 40-43 would be difficult to play, is there a reason for why the right hand is playing in the bass clef and then starting from m 44 plays the same melody in the treble clef? Wouldn't it make more sense to have the usual 4 bars with repeat signs for those phrases, with the right hand playing in the treble clef so that it won't clash with the left hand?
I can have a think about how else it could be simplified, maybe it might be best to take out the waltz-like quavers in the left hand in some places. For example, in my "Norse Code"
arrangement, as soon as another voice stepped in starting from m 17, I replaced the waltz beats with the newly introduced melody, then added the waltz notes back in m 25. Even though after that section there are almost always at least 3 voices intertwining, I alternated between them depending on what voice seemed the loudest or more interesting to me, with the last page ending in a bit of a contrapuntal texture. Don't worry about trying out different combinations and seeing how they sound, the result might even surprise you.