We have been using the Sprinkling Rite during the Easter Season in place of the Penitential Act. I realize the Sunday of Easter takes precedence over the Confirmation texts. However, given the Renewal of Baptismal Promises and Professional of Faith is stated during the Rite of Confirmation, it almost would seem that one would use one of the other options for the Penirtential Rite and use the Sprinkling after the Renewal of Baptismal Promises, just like on Easter Sunday. Given Google these days, there are Confirmation documents galore from various dioceses throughout the world on how to and how not to celebrate the Rite of Confirmation. I can’t find anything specific about this particular question. My guess – keep the Sprinkling Rite, and Rite of Confirmation is separate.
You are correct: You may keep the sprinkling rite, and the Rite of Confirmation is separate.
For some context, in the typical edition of the Roman Missal, the sprinkling following the renewal of baptismal promises is unique to the Easter Vigil. We have a special permission in the US to use it on Easter Sunday as well.
Confirmation has plenty of symbols. It doesn’t need more.