I'm a bit confused ...
Do you mean give ORS by themselves? Ie, no water? How much blood loss are you talking?

I wouldn't give ORS, the volume is more important. I mean, the person still has the same concentration of ions in their body, just less overall total. The electrolyte abnormalities, if any, wouldn't be all that severe (blood loss would kill you first) in an acute event. Even in hospitals they give 0.9% sodium chloride, not for the salt, but because the osmolality is the same as the body.

The OJ and crackers just replace fluid and sugar, have nothing to do with the red cells (FYI).

Also, not sure what you mean by a "high absorption rate." Salts and water are absorbed in different parts of the intestinal tract.