I did a very similar beer at about the same time. I considered gelatin but decided I did not want to precipitate out the delicate apricot flavors.
If the cloudiness consists of negatively charged particles, Gelatin will work. Isinglass is much more effective if you can get it.
Either way, I read something form the maker of isinglass some time back, that you should allow the temp to rise when you add it. So, if you have the keg in a freezer, pull the keg and add the gelatin then leave it out for some time (over night? a couple hours? I don't know) then chill again.