Thats would be great for playing in winter, and if I remember well know have less maintenance to do when using HPA in painball, should be the same in airsoft.
Just not sure if the mags and the gun with support the pressure of the HPA, but if what you said is true it may be something worth to try. Gonna do more research on this.
-KWC P226 X5
-Ra-Tech WE HK416