Be clear about the competencies needed and those you currently have in the HR team. Don’t simply switch job titles. Invest time in assessment so you have the right people in the right roles and then help them develop the right skills.
Continually review the effectiveness of the model you have introduced. It is unlikely that you will get the model that suits you straight away. Making the necessary tweaks and changes as required will increase chances of long-term success. Include line managers in your reviews.