Can one learn Thiruvaimohzi through Sandhai? Are Samasrayanam and Bharanyasam a must to learn them? Can it be taught to children? Are there any rules for this?

It appears, in the past, children have been taught by elders even without them undergoing Samasrayanam and Bharanyasam. We follow the path shown by our elders.
Notes
To learn the meaning of Thiruvaimozhi one must have performed Samasrayanam and Bharanyasam.