It souds like a very workable Idea to me. clean, safe and ready when you want it.
Dave
Cycled water is essentially a misnomer, the bacteria colonize on surfaces, and are not free floating in the water column in any real or usable quantity. If an LFS is selling it they are fooling their customers.If you wanted cycled water quick, most LFS sell it for around 20p a gallon...
Dave