Allowing specific users to assign journeys through journey template security?

We are looking to allow specific users that done have any unique security to able to assign a journey to users on an ad hoc bases.

We have a journey that is set up for hire and rehire but there are some users the transfer within the compnay that will need journey assigned. The best workflow that we have determined is to allow the 5 users that manage these users to have access to assign the journey as needed. the issue we are finding is that I can only see a way to allow users to add this journey is if i provide a role that they share to allow them that access. these users are either manager or normal employees so they don't have an