How is it cheating? The only nitpick I would point out is that there is no pause between the castings, but I think that is the property of Wild Magic. Another nitpick I would make is the allowance of stacking the Chaos Shield in Triggers or Contingencies( although at higher levels, you can safely afford to cast just one Improved Chaos Shield( or 2 Chaos Shield in a Minor Spell Sequencer( which really means that you can just use your level 1-4 spells
))).
Other than these factors, I see no fault in using such a tactic. It is merely a smart usage of spells. It
is supposed to work this way.