Exorcists Chapter Fluff Idea

I've had an idea I've been kicking around for a while but never followed through on. In the official exorcist fluff it states that the chapter was created as an experiment to create demon hunters.

So instead of names I'm thinking of giving my marines Experiment numbers with an identifier stating a specific branch of the experimental project such as

Alpha - Combat Troops

Beta - Psychics

Capa - Intellectuals such as Apothecaries and Tech Marines

Then others for different branches

Delta - high Aggression troops

Epsilon - Marksmen

Fox - Commanders and Strategists

etc.

So my librarain would be - Beta-247, Captain could be Alpha-165

Good idea? Bad Idea? give me your opinions.