Would you consider naming the designation as Client Relationship Office/Manager ?
It would look good on the visiting card and would redefine his role in a positive way. Inspire him to look beyond collecting cheques and understanding the issues at client's end that can be resolved by your firm.
Infact a designation such as CRM will give him future opportunities to grow beyond collecting cheques.
I wait to hear from our experts on this.
Wish you all the best!
2nd July 2014 From India, Mumbai