Actually it can be done(sort of if you have the right keyboard) heres how I did it . Its still
a work in progress.

In the picture you see I build a prototype of a keyboard stand that allows me
to put my pa600 on top.
Right below on the bottom shelve is the samson controller. The spacing is around
7” or less between keyboards.

I go to my 16 track sequencer mode and set the following:
track 1 = organ upper
track 2= organ lower manual (controlled by samson)
track 3 = bass pedals (controlled by studiologic midi pedals)

midi cabled as follows:
midi out of bass to midi merge box in
midi out of samson to midi merge box in
1 midi cable from out of midi merge to midi in of korg.

Now here’s what I found :
it works. Now when I switch back to style mode , the controllers still trigger the designated sound
even though im in style mode. So I can play bass pedals from the sequencer and mute the auto bass track in style. I got this idea from korg uk. They have a package that converts your pa600 to a spinet type organ with pedals.