Why not do a dry start? You only add enough water to keep the roots moist and the rest of the plant is largely out of the water. The plant will grow far more quickly and cover the area faster. The only downside it that the old growth dies off when you fill the tank but the new leaves will have plenty of roots to grow from.
In answer to your question, it's not common to dose "ferts" during a dry start but that doesn't mean to say it couldn't or shouldn't be done. The dosage is based on litres in your aquarium for a reason, the fertilizers are largely diluted by your aquarium water but the plants absorb what they need to, removing it from the water. One could argue that in tanks with equal plant mass, say 100x50cm of glosso will use the same amount of ferts whether the tank is 25, 50 or 100L as the plant mass is still the same.
At the end of the day, it's up to you. Personally I wouldn't bother though, my glosso grew well just under lights and without CO2 you're just asking for algae issues.
What ferts are you planning on dosing by the way?