You can try using a 32H hub for a 16H rim. The difference in spoke length is not likely to be large enough to cause a problem.
If you're lacing "radial", there won't be any difference in spoke length, but the spokes won't be truly radial, one side will be pulling and the other side will be pushing, which means the hub shell will have a permanent torsional stress in it. Like many bodges, it probably won't kill you, but if you have any sense of mechanical beauty it will annoy you :)
If you're lacing "radial", there won't be any difference in spoke length, but the spokes won't be truly radial, one side will be pulling and the other side will be pushing, which means the hub shell will have a permanent torsional stress in it. Like many bodges, it probably won't kill you, but if you have any sense of mechanical beauty it will annoy you :)