[FROG] Any way to force a local route weight to 0 ?

Hello, I'm looking for a way to be able to force local routes to a weight of 0 (apart from modifying the source code). To be honest I don't think there is but maybe I missed something. My goal is to use a local route as a backup solution (if BGP is down for example), but to use it only if not sent through BGP. Thanks. Regards, Thomas