It’s important to distinguish between these things.
Throwing a stone in the way you describe would be fine in the sense that there’s nothing morally wrong with it, so if it helps you as a symbolic gesture then you could do it, but since you still have to confess to a priest and receive absolution, it seems unnecessary.
Spiritual exercises can be useful if you’re going on a retreat or trying to prepare for a big feast day by moving closer to the Lord. If you’re talking about St. Ignatius, they’re mostly focused on discernment, which may or may not be useful for a particular person. I honestly haven’t done them myself. Perhaps in the future, I may.
Stations of the Cross is a devotion that is not only approved by the Church, but also indulgenced, so it is more along the lines of the Rosary or Adoration. It is an established spiritual practice by which we can gain a definite benefit (a partial or plenary indulgence). You’re not going to get an indulgence by “throwing a stone” (and you still have to go to confession). You could possibly get some type of indulgence by doing spiritual exercises - for example, if daily mental prayer was part of the exercise, you could get a partial indulgence. However, the Stations are one of the four ways you can get a plenary indulgence, the highest kind of indulgence you can get, every single day, so I would put that devotion above the other two things you said, myself.