In the event this is determined to be within the rules, the question becomes one of the DSC PWM output being able to drive enough current to power the optoisolators on three Jags. The
spec on the DSC says 15mA, so up to 5mA for each of the three Jags.
The
spec for the Jag says 5mA typical current, but up to 25mA maximum current. Note that 25mA is over 15mA, so this maximum is a theoretical issue in any case.
Bottom line is that this should work electrically, but if you have the extra PWM outputs, just using these avoids any question, so long as you couple them in S/W.