Interesting read and assessment on the Dee study.
This FAO link says that your best bet against ASFV would be alkalis, hypochlorites, etc. http://www.fao.org/3...0E/Y0660E03.htm
Are you importing grains or other foods from an impacted country? Where do you see the risk of ASFV coming from?
Based on the reading I think that a strong strong vendor approval program and FSVP will be your best bet for now. Once/if it hits the US then, yes, I would agree that some boot wash program should be implemented. Do you all already have a captive boot policy?
Also, are you doing environmental swabs? Seems like you can keep an eye on Enterobacteriaceae, for general hygiene; granted it won't give you a definitive answer on what's present.