My guess is those internal amp wires are too short to make a difference and you might do more harm than good removing them and (poor) hand soldering new ones.
But if you like to go for it ... don’t forget the wires inside your speakers. Depending upon their size there may be more length there and you may be amazed, after you just got your $5000 speaker cables, what standard wires inside the cabinets you have attached them to.