That sounds like a stupid amount of work and a massive mess to balance just to add something that majorly clashes with SS's combat arch-type. Nothing is really random in combat and stuff that is, isn't an "all or nothing" bet like this would be
there are plenty of things that are random in combat unless you believe that this is a deterministic universe, in which case nothing is random.
probability of kill / malfunction etc. are all expressed as random chances in studies about combat my man.
but ultimately adding evasion to fighters might be helpful in balancing them and more feasible than simply making them touhou-capable platforms which would probably melt most CPUs in any large size fight (though i might be wrong about this)
it's probably more feasible than simply giving them more health, because giving them more health would result in a bunch of knock-on effects like needing to increase PD damage which might make PD then viable assault weapons which might skew game balance towards close assault etc. etc.