Hi,
I heard a similar discussion in the past in a different forum, and even if not disable myself (so offering an active contribute to the solution), I'm always trying to help, whenever possible.
Korg started to use the touch screen, first in the musical instrument area, in the Trinity (I've still one in my room), then in Triton, Pa1X and Oasys. It was a revolution talking about graphical interface and intuitivity, but obviously this became a problem for visually impaired people.
I'm not defending any position, I'm just considering that Korg, like Roland has pointed their production in this direction and I've to admit that I like this kind of interface (using a Yamaha once I found myself pushing the display ... with no luck), but obviously you can't.
I can understand your difficulties (owning a Pa1X), since pages are always different and it's hard to come back with a solution. Once I heard that a blind musician using a Trinity has fixed some reference point in the border of the display (a kind of ship battle) to have at least the possibility to select sounds and do very basic things. Don't know if this can be of help in Pa1X, but you can anyway try.
Regarding contacting Korg I think that you can send a message (I think there is somewhere a contact in their site) or contact your local distributor asking to pass your letter to Korg: they for sure can do this.
My last, but not least, suggestion is: I think you have to contact them just proposing a possible solution for the problem. For normal people is sometime difficult to understand disable problems and proposing a solution is world of difference against complaining only.
Hope this of help and good luck for a positive solution of this history !
Warm regards.