Re: should i?...
the best thing you can do for all the parties concerned is to be honest. Tell the people at your work that he may be a bit lacking in skills but that he really wants to work so maybe what he lacks in shmartz may be overcome with his enthusiasm. Tell the doubtful friend that he will be given a chance with an interview - the rest will be up to him.
this way, you're doing the best for everyone concerned.