You do have to take some pitchers. The approach I would take is:
1) Populate your draft board for the first three rounds so that there are twice as many hitters as pitchers. Make sure that over time this results in you taking twice as many hitters as pitchers in those rounds.
2) College pitchers are a good bet in rounds 4-10. Mostly this reflects the fact that you won't find too many high ceiling types in those rounds from any demographic. So might as well go for a disproportionate number of high floor college pitchers in those rounds.
I think the above approach will leave you a little thin in pitching and any team taking it will have to compensate by acquiring major league level talent to fill in the back end of the rotation.