The load on each circuit would need to be less than 12.5A, but you could use the next larger standard breaker, eg. a 15A breaker.
Note that for derating based upon number of conductors in a conduit, you get to work from the temperature rating of the wire, even if it is higher than that of the terminations. So you would probably use THHN 90C wire, with an ampacity of 30A, 15A after derating with a 15A breaker.
-Jon