Threewheelerer

I just was given a 1986 trx250 utility version that has the whole front end cut off. I wanted to convert the fourwheeler into a three wheeler since there is no way of putting the front end back on. The conversion seems that it could be easily done besides the steering. The steering on the four wheeler has a Long steering stem area and the three wheeler a short one like a dirtbike. Is there any way of cutting the steering stem down or does anyone have any other ideas? Thanks!