Not too bad of a reply. Based on some good physical principles, although an incomplete understanding of them.
The problem is that the equivalence between acceleration and gravity only applies locally, not globally. In particular, they deviate when second order effects are considered. And coriolis forces are second order effects (dependent on the square of the angular momentum). In essence, they show how a local gravitational frame will deviate from an equivalent local accelerating frame.
A very nice try, though.
In physics, the principle of locality states that an object is only directly influenced by its immediate surroundings. The concept is that for an action at one point to have an influence at another point, something in the space between those points such as a field must mediate the action.
Coriolis is noticeable only for motions occurring over large distances and long periods of time, such as large-scale movement of air in the atmosphere or water in the ocean.
It makes no difference if the Coriolis effect is added... it is still paradoxical given that the Coriolis force is proportional to the velocity of the object. Any friction, gravity and your constant velocity of motion are equivalent to gravity, friction and the constant velocity of the projectile. The same physical rules apply. Simply demonstrated if you take any round projectile and hang it from a string. It will go through the same motions, first a uniform straight line and then the circular motion starts as the string is constantly pulling it toward the center of a the circle. The string would force the ball to turn.
This is easily explained by Centripetal force. One common example involving centripetal force is the case in which a body moves with uniform speed along a circular path. The centripetal force is directed at right angles to the motion and also along the radius towards the centre of the circular path.
We reach the same circular conclusion, equivalence paradox.
Since the Coriolis Effect is pretty much only noticeable on a large scale, it is much easier to lessen the probability that it's actually occurring on this minuscule scale of the pendelum. Also, when a Focault pendelum decides to go the opposite circular direction... would we call it anti-Coriolis effect? Similar to when a cyclone goes the opposite direction it's supposed to, just call it an anti-Cyclone and conclude that the Earth is spinning the opposite alleged-direction?