Unfortunately, this issue of calculating magnetic force is quite difficult to do since it traditionally requires knowledge of some quantum mechanics as well as some hefty numerical integration depending on the geometry.
I would recommend (for someone of your likely mathematical standing) to consider the case where the magnet is approximately the same size as the bismuth, and to calculate the diamagnetic force caused by the bismuth, you can use the magnetic susceptibility of bismuth to calculate the induced counter-magnetic field in bismuth.
The magnetic susceptibility of bismuth is about -1.66*10 (-4).
Then you can approximate the force that each of them experience to be the force between two magnets with different magnetization. However, note that they are of constant ratio, since the magnetic susceptibility of bismuth fixes that particular quantity.
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