No. Just, no. You shouldn't be blowing valuable cooldowns on something as trivial as regen duration. The apparent lack of synergy is wholly a non-issue. Time Dilation doesn't even net you a second cast of Aspected Benefic. Celestial Opposition at best gets you two extra ticks, and only if it's perfectly timed. You have far better things to do with your duration-increasing cooldowns, like boosting enhanced Balance or Spear uptime.