Creating an effective 3D fine Serif typeface

Can anyone help and please forgive me if this is basic to a lot of people but I'm painstakingly trying to create a 3d serif typeface that is too fine to work effectively using the 3D bevel and extrude option. I need the offset type to appear as flat white (diagram 2) but in 3D so there are no gaps between the serif of the serif in white and the serif in black (diagram 1). I have so many different versions to do for a client and am hoping there is an easy less painstaking way of doing this without it being so ridiculously time consuming. I just can't get a good effect from the 3D effect version of creating it. Please help! Thanks so much x