Hey I'm just hearing about frozen rice but yeah I remember those old boil in a bag rice a roni things.Freezing rice in the bad it came in from the grocery store then letting it thaw at room temperature. It doesn't harm it. Had rice weevils once and I started searching on how to prevent it.
I suppose the mylar bag with oxygen absorbers could work too.
The Food grade bucket and the mylar bag with oxgen absorbers is the way all the dudes on Doomsday preppers stored their beans and rice.