SOCHI, Russia — Francis Rossi and Rick Parfitt of Brit rock band Status Quo are to play cameos in a laffer about a Quo tribute band.“Deeper n’ Down” is in the final stages of development by its producer, film music supervisor Don Gallacher. London-based Gallacher has a collaboration agreement in place with Rossi and Parfitt, whose latest album “Quid Pro Quo” went straight into the U.K. top 10 charts this week. The film, about Axe, a 40-something former guitar tech/roadie, who is forced to face up to his parenting responsibilities after neglecting them for more than 30 years, will be shot on location in the U.K. and Eastern Europe. Gallacher, of Golden Bay Productions, is in talk with potential directors. He said the story turns on Axe’s relationship with his musically-inclined but inept son Quentin.