Best way I've found to defunkify my Vibrams is to soak them in Oxyclean (yes, "as seen on TV" Oxyclean) overnight and then wash them in the washing machine and air drying.
This is with KSOs. With the Sprints, I've never had an odor problem, but they can air out more easily.
I suspect that if you had some kind of warm-air (~35C) device (e.g., a heat gun) to gently blow air through them post workout, one could keep the odor on KSOs down.
Why? A dryer gets far hotter than 35C. I just mean enough warm air moving through the shoe to dry it quickly. A decent heat gun should give you that control.
I bring them into the shower, or soak them in sports detergent for an hour or so (squish them a few times). Twice, if needed. Rinse, dry over air purifier / fan overnight, and they're practically new-smelling, even though I've got pretty funky feet.
This is with KSOs. With the Sprints, I've never had an odor problem, but they can air out more easily.
I suspect that if you had some kind of warm-air (~35C) device (e.g., a heat gun) to gently blow air through them post workout, one could keep the odor on KSOs down.
Don't tumble dry them though -- the glue melts.