I have a friend who got tired of replacing fan clutches so he just tack wleded his -- made it a rigid assembly. You can do the same thing and save weight by replacing the clutch with a spacer, but keep the solid fan.
Most of you lads are too young to remember, but until the late 60's or early 70's all fans were solid, and we didn't have viscous clutches. The flex fan and the fan clutch were both introduced as a way of squeezing a bit more mileage out, by allowing the fan to "relax" at highway speed when it isn't needed for cooling. Putting in a rigid connector won't do any harm, other than maybe costing a tenth of a MPG.