What you say has been one of the interpretations of many Christian scholars and it seemed logical to me at first thought.
I don't think that many expounders of Revelation teach that this rider represents the preaching of the Gospel. I think it is still not common to hear this.
However, the number seven in the Bible is sometimes divided as 1 + 6. Or it may be grouped as 6 + 1. So that one of the seven seals is devoted to something not related to a negative matter would not be overly surprising.
You have six seals opened and then silence in heaven before the last seventh seal is opened.
"And when He opened the seventh seal, there was silence in heaven for about half an hour. And I saw the seven angels who stand before God, and seven trumpets were given to them." (Rev. 8:1,2)
This puts passages seems to arrange the seven seals into 6 + 1.
The point I make is that sometimes in constructing seven you have a 1 + 6 or a 6 + 1 design in the Bible.
It is also the case that you could have a 1 + 3 scheme to construct 4.
But as I looked closer at the totality of the book of Revelation, this did not seem to fit with the purpose of the remainder of the horsemen or with the 7 sealed scrolls that bring judgments upon the people of the world.
It seems quite fitting to me.
It is easy to see only negative judgments in an exciting book like Revelation. I think one has to go a bit more below the surface to see Revelation is more dedicated to the victorious positive matters of God's will.
It is quite positive that not only in human history war, famine, death and hades are galloping through the world. Ahead of all these dreadful matters is the "GOOD NEWS"
of God's Gospel. It goes forth to conquer.
If the Gospel does not go forth to conquer than there could not be a positive conclusion to the book or Revelation or to the entire Bible.
So I stand with the first horse and its rider being a 1 + 3 design rather than automatically assume that the first seal must be made to conform to the other three dreadful and negative seals.
The idea of the opening of the first seal as a judgment of the antichrist spirit for the unrighteous fits better, with second seal judgment of war, the third seal judgment of famine, the fourth seal judgment of death, the fifth seal judgment of the vengence of the martyrs, the sixth seal judgment of anarchy, and the seventh seal judgment of the 7 trumpets, which includes the 3 woes.
In my view you get both. The arrow is shot from the bow. This Gospel speaks of the fatal arrow already piercing into the heart of the Devil. Satan's only recourse now is deception. Christ has judged him on the cross.
So in seeing the first rider with the bow and crown we do not loose the good news that the Devil HAS been conquered and with him antichrist.
Jesus in His crucifixion proclaimed victory over every antichrist spirit -
"Now is the judgment of this world, now shall the ruler of this world be cast out.
And I, if I be lifted up from the earth, will draw all men to Myself." (John 12:31,32)
The church fights by standing firm in Christ's finished victory. We stand in the accomplished victory of Jesus on His cross over the prince of this world - Satan.
Before He goes to the cross He proclaims that He has overcome the Devil-
"These things I have spoken to you that in Me you may have peace. In the world you have affliction, but take courage; I have overcome the world." (John 16:33)
We preach a gospel of peace. We preach a gospel of Christ having overcome on our behalf. This is the victory that overcomes the world, our faith.
It is fitting that we see history in this way. What is the main event in history? Is it antichrist? Is it war, famines, earthquakes, starvations, deaths and Hades? The most important thing is the Christ has overcome and we spread a gospel of His victorious conquering of Satan and the world.
That is precisely why it is the Good News in the midst of this chaos. It is the truth.