Creating an artificial ring planet by placing an object between Mercury and Venus with enough mass to form a stable ring system is not feasible. The stability of planetary orbits depends on a delicate balance of gravitational forces, and introducing a massive object in that region would likely disrupt the stability of the entire system.
Additionally, the proximity of Mercury and Venus does not imply that they will collide. Planetary orbits are determined by various factors, including their initial conditions and the gravitational interactions among celestial bodies. While it's true that the orbits of Mercury and Venus come relatively close to each other at times, their paths are carefully calculated to avoid collisions. The likelihood of a collision between Mercury and Venus is extremely low, given the vastness of the solar system and the precision of celestial mechanics.
It's important to note that the formation of ring systems around planets is a complex process involving specific conditions, such as the presence of large moons or the disruption of asteroids or comets. These conditions are not present between Mercury and Venus in a way that would allow for the creation of an artificial ring planet.
In summary, the creation of an artificial ring planet in the region between Mercury and Venus is not currently possible due to the disruption it would cause to the stability of the planetary orbits. Furthermore, the chances of a collision between Mercury and Venus are negligible, as their orbits are carefully governed by gravitational forces.