My first DV trip I brought a ktm 950 and a drz. Enjoyed the ktm on easy sections and road. Never had optimal tires for either. I really prefer toting a bike via jeep/rv and camping than riding out carrying gear. Don't enjoy the adventure bike deal. I use street legal dirt bikes for off road and street bikes for aggressive street.
That xr250r is a hoot! No doubt. Maybe with a xr280 kit and xr400 forks might do the trick. Very light and maneuverable. Don't think open dez is its specialty. Been on some hill climbs that turned into first gear rev fests. The xr400 and xr600 are probably perfectly. If I stopped being indecisive id probably sell one!