It rather depends upon whether you want a marketable skill which you could use in later life. As a QFI though, it would be very surprising if your first QFI tour would be on frontline types - more likely on Hawk or Tucano. As a QWI you could analyse film/video, talk esoterically about the radar and do a lot of rear seat convex rides; in later years you could work for some defence contractor. As a TI/'pseudo' QFI you would merely be asked by any future employer why you weren't selected for CFS or why, if you wanted to instruct, you didn't apply for CFS in the first place.
Go to CFS, get a Hawk tour out of the way, ask for EF and then you could fly/instruct on that TFN??