Splinted or unsplinted?

Hi, I planned to splint screw-retained crowns 12, 13, and 14 (implant sizes 3, 4,3, and 5.0 mm). Patient now wishes to have them as separated crowns for hygiene reason. I am concerned about cantilever effect on #12 and especially #14 (about 4 mm cantilevered)? What would you advise? To splint or not to splint? Another unrelated question. Would it be sufficient if I only placed implants #12 and #14 and have a bridge with #13 as a pontic? Thanks!