I did a short test with my reabank of my hardwaresynth. I sorted the sounds the way I wanted, let's say sound#5 at first place in the reabank, sound#10 second, sound#20 third and so on.
They indeed appear then in the order I've chosen, so you too can sort yours to your needs.
The only thing to care about in the text editor is the number at the beginning of the line cause that's the program change number (and the bank of course) but I'm shure you knew this already. So you can try to sort at least the instruments within a bank.
I'm not shure if that's what you are looking for exactly, a quick look at the manual appendix of your Casio showed A LOT of sounds!