On the re-fingering context, Marty himself never plays those arpeggios with the stretches from the album version live. Even in videos of Megadeth from the 90s, he always changes the pattern to avoid the big stretches.
Notice that on the G major arpeggio, he does not do the alternating top note up to A, and on the E7 arpeggio, he opts for just a 2nd inversion E Major triad so he just needs to barre his 1st finger at the 12th fret.
I’ve also had issues with my left hand in the past from playing too much stretchy stuff on an extended scale neck, so I always play Tornado with Marty’s friendlier fingerings.