Got the point...I'm just a little slow. 
.
Your solution seems eminently reasonable.  One tiny suggestion replace the CFL lamp with good quality LED.  Less power intensive, more light, less harmful flicker and much longer life span.
.
IMHO your solution will become very common on Oahu as the PUC pushes HECO to become "100% Renewable".   The locals who rave about their rooftop solar won't be happy when the grid they disparage degrades to the point that it can't accommodate the draw when everybody fires up the central AC on those hot, Hawaiian nights. 
.
Finally, given the quality of service on your island have you installed protection to insure that the sags, surges, and spikes don't fry your electronics?  The damage is usually not immediately apparent but it significantly decreases the lifespan of expensive components. MECO will never admit they are causing the problem and the PUC is too inept to even realize that it exists.
.
Thanks for the info.