I don't think sticking three 24-man alliance raids into the 4-man MSQ roulette queue will solve the problem as people will just find ways to cheese that. The solution is to rebalance Crystal Tower, and even the Heavensward alliance raids to an extent, so they take as long as Ivalice and newer raids do. Since Endwalker has released, the 50/60 alliance raids are easily twice as fast as the other alliance raids which is why people are abusing the system so much.