They could require volunteer hours at charities. They could set up a temp agency and require certain hours. They could employ ‘Head Hunters’ or run a robust job seeking system. There are many who want very long time limits for eligibility and those that want very short to zero limits. Every employee should buy the policy that they wish.
Government’s monopoly controls creates a one size fits all system that is based on political considerations. Politician being able to vote on more or less generous plans or the length of those plans cause many problems. If there has to be a plan, just require the company pay a certain percentage into the premium of a plan in the open market that each employee picks out.