Those "large technological investments" would be lessened by making small investments sooner and developing rendezvous with every small potential hazard, do all that can be done in situ (on the object itself) to alter the threat. This would be the deterrent laboratory for future flights, and builds rungs to the ladder of large technology needed to counter a genuine planet killer.

Cataloging and continuously updating the inventory is not a problem, even becoming easier day by day. Counting is what computers do best.

I don't see evacuation as an investment in the future, it's more like an escape from reality. Spaceflight is what is needed, with footprints on the threats. We need to go to all of them, we need to investigate all of them and we need to work "on" all of them.

Sounds like a new bureau for the Department of Defense, with UN involvement.