The point being that it needs to be the whole shebang.
For two reasons.
Economic – comparative advantage won’t play out properly if we’ve a protected sector (s). Protection will mean that the reorganisation to efficiency won’t happen properly.
Political – give one group privileges at he expense of all others and all will be calling for privileges.
It doesn’t have to be overnight though. It can be, possibly should, a process. Straight line (ie, from base year, not each year) 25% off import duties each year for four years. Double quotas each year. In year five, no duties nor quotas at all.