Shellscript to use SandS and to assign Shift_R to "@"

.xmodmap

pointer = default

! shift_r -> @
clear Shift
add Shift = Shift_L
!remove Shift = Shift_R
keycode 62 = at

modKbdSandS.sh

#!/bin/sh

#sands config
killall xcape # to prevent xcape duplication
xmodmap -e 'keycode 255=space'; xmodmap -e 'keycode 65=Shift_L'; ~/opt/xcape/xcape -e '#65=space'

xmodmap .Xmodmap