Exact practice rates
Each signal has a base 0.8% chance of a 5★. Signal 80 since the last 5★ is guaranteed to be a 5★. A 5★ has a 50% chance to be Lyra; otherwise it is Mirelle or Kael with equal chances. After an off-banner 5★, the next 5★ is Lyra. There is no soft pity in this practice implementation.
Other results are Soren, Eira, Amelia, Toma and Noct with equal chances. This simplified practice pool contains only 4★ and 5★ Resonants. No money is accepted.