You'd be better off gearing up Kanan to 8 and just retrying the event over and over rather than waste a zeta on just this event. Also, have you done your research? There are many threads around about the event with low gear teams ... below is one.
I'd also add, at low gear levels I think you're better off using CHOPPA than Sabine. You want that extra survivability. Sabine is great in PX, but only at higher gear levels. If you can get the little droid to gear 7/8 and swap at Sabine you'd be in a lot better shape. He got a great upgrade since the first event as well so will be even better than at the time the thread below was created.
https://forums.galaxy-of-heroes.starwars.ea.com/discussion/117206/7-thrawn-no-sabine-new-low-for-requirements/p1