The DMC predates the Eucharistic Prayers for Masses With Children by a few years. It does reiterate the importance of the EP, and how the priest prays it:
52. The eucharistic prayer is of the greatest importance in the eucharist celebrated with children because it is the high point of the entire celebration. [See GIRM 54.] Much depends on the manner in which the priest proclaims this prayer [See DMC 23 and 37.] and on the way the children take part by listening and making their acclamations.
There’s a lot one can do with focusing children on this. An underutilized possibility is dampening the lights or focusing them on the altar.
The disposition of mind required for this central part of the celebration and the calm and reverence with which everything is done must make the children as attentive as possible. Their attention should be on the real presence of Christ on the altar under the elements of bread and wine, on his offering, on the thanksgiving through Him and with Him and in Him, and on the Church’s offering, which is made during the prayer and by which the faithful offer themselves and their lives with Christ to the eternal Father in the Holy Spirit.
For the present, the four eucharistic prayers approved by the supreme authority for Masses with adults and introduced into liturgical use are to be employed until the Apostolic See makes other provision for Masses with children.
And as we know, this other provision was added in triplicate in 1975.