Maybe if deep tunnel were limited to teleporting on creep only?
Probably the requirement I would prefer the most.
Also, you can try the monobattles method and limit queens to one per hatchery.
Nope, it's pretty much a nerf for queens overall. It's preferable for monobattles' purposes but not for W&M's situation.
With the off-creep movement upgrade, can you also allow queens to have Transfusion Auto-cast with smart casting?
A very tricky situation since that can ultimately make them way too powerful as healers without putting some gas cost to them.
Longer creep range? Is the possibility of endless creep growth probable (at a moderate rate, clearly not at a fast rate)? That would keep other players on their toes if they left the Zerg unchecked.
That was one of my ideas but when I tried to stack two different growth, it did seem to take the best values of everything. In other words, very high range + insane growth.
Ultimately, the idea of longer range for creep growth + creep tumor would be to make creeping the map less painful but without giving mass easy creeping for Zerg on a golden plate.