May the Stations of the Cross be prayed during Eucharistic Adoration? May the Stations be ended with Benediction of the Blessed Sacrament?

Benediction is part of the Order for Solemn Exposition of the Holy Eucharist. This order of prayer is part of the Church's official liturgy. It is no longer permitted for benediction to be added to end any other service or devotion. The USCCB has a more complete explanation on their website.