The tradition of the Oplatki originated in Poland during Early Christian times. This Christmas custom began with a simple thin white wafer, similar to Communion hosts, baked from flour and water. The wafers are designed to display Christmas images, such as the Nativity, Star of Bethlehem, or the Holy Family. 
 
The Oplatki (authentic Polish pronunciation is O-pwaht-kee, which is the plural form of the word) are enjoyed by families, typically right before the Christmas Eve meal. The entire family will gather around the table with the Oplatek (pronounced O-pwah-tek, which is the singular form of the word).  Generally, the eldest member of the family will begin the ritual by breaking off a piece of the wafer and passing it to another family member with a blessing.  This blessing can simply consist of what you desire for your loved one in the upcoming year – whether it be good health, success, or happiness. The wafer is passed from person to person until all have had a piece and all have been given blessings. The purpose of this act is primarily to express one’s unconditional love and forgiveness for each member of his or her family. 
 
This tradition is also common to other nationalities. In Lithuania, the wafers are part of the Kucios meal and can be called by many names, including: plotkele, paplotelis, or plokstainelis. Depending on where the family is from, they may even say kaledaitis. Slovaks call the wafers oblatky. In America the tradition is often called Christmas Wafers. 
 
The significance of the Oplatki Christmas wafer is that it shadows the Eucharistic meal that Catholics participate in at each Mass.  Just as we share in the Eucharist as one family in Christ and receive Christ’s love through the Eucharist, the Oplatki allows for one’s immediate family to come together and share the love they have for one another.  This symbolism is deepened by the fact that the name of the town where Jesus Christ was born, Bethlehem, means "House of Bread," which makes the Oplatki tradition an especially beautiful way to celebrate the charity and unity so characteristic of the Christmas season. 

SOURCE: https://www.catholiccompany.com/content/oplatki-christmas-tradition

I don't suppose it's an unwarranted intrusion, any more than poinsettias are during Christmas, or any other extraneous decoration. Things like decorations, are not intrinsic to the liturgy, and are not really referenced in liturgical books. 
 
Perhaps there is some violation of liturgical norms in some parishes where a kind of para‐liturgical Mass service is conducted for the lighting of the advent candle. I have observed where the families are invited to come up to light the candle while some verse of Scripture is read etc. These sorts of things might be considered an intrusion. But if the advent wreath is simply there, and the candles lit before Mass, there seems to be little harm in it. 
 
As for Lutheran roots, most historical researchers would probably confirm this. Catholic parishes have adapted the advent wreath by the use of purple, rather than red candles. 
 
You are certainly free to like or dislike the tradition of the advent wreath. Most Catholics I speak with find it meaningful. But some caution is in order regarding your rejection of something simply because it is either modern, or comes from outside Catholic sources. 
 
In the first place, your concern is somewhat at odds with the Catholic instinct, which down to the centuries has often taken up things from the secular world, or other religious traditions, even non‐Christian ones. It is part of the genius of Catholicism to take up whatever is good, true or beautiful in the cultures where she interacts, and give them a distinctively Catholic meaning and flavor. 
 
I would also caution you based on the words of Jesus, who counsels a kind of prudential wisdom about things like these when he says: Every scribe, trained for the kingdom of heaven is like a master of a house, who brings out of his treasure what is new and what is old. (Matt 13:52) 
 
Therefore, categorically excluding something because it is modern, or outside explicit Catholic origins is not the instinct either of the Church or the Scriptures.