You have a problem with your premise, abraxas. Dissolution of gas into liquid is not a chemical reaction in the respect of what you are looking at. Raising the temperature decreases solubility of gasses into liquids, although you can compensate for that with higher pressure.
Even if you could get the gas dissolved more quickly, you'll run into problems when you cool that beer down to serving temperature. Simply cooling probably will not reduce the higher head pressure to your desired serving temperature, so you'll have to bleed off pressure or deal with overcarbonated beer.
If you really want to get carbonation faster without all the hassle of finding the sweet spot, just cool the beer down to your desired temperature, set your regulator to the pressure at which you will keep the beer, hook it all up, and shake.
TL