When I set a course, In, lieu of a true snowboard start, I use 2x4's, and try to set them around 30" high, approximately 30-36" apart. Skiers usually don't have a problem as they will have their hands closer together and further in friont of the gate. Ice the 2x4s in the day before for best results. otherwise angle them into the start such that the direction of pull drives them more into the snow, than pulling back against the snowpack, which will cause them to loosen up pretty quickly.
Congrats on this. In my league, I am the only boarder. stuck with ski gates and borrowing poles (which I drop out of the gate) for the start...
I challenge every BOL member to get out to at least one race this season...