I think the idea is interesting, but the generally recommended amount per 5 gallons is pretty small - less than 3 oz.
I think you'd easily overshoot that mark by dropping a cube in every single bottle.
It'll still be beer though, I would probably be impulsive enough to try it with some used cubes or something... (provided I was very careful about harvesting and keeping them sanitary)
 I also might only experiment with, say, half my batch. That way I might be able to blend an overoaked bottle with an unoaked bottle in the glass, if disaster were to strike.