Being sufficiently close to a shrieker when it shrieks, maybe directly adjacent or within a radius of 2, should make you temporarily deaf.

Shriekers caught in a flash of light shriek (however, this should only come from non-renewable sources to avoid being able to use them to farm monsters, or possibly this shriek should be unable to summon monsters.)

If a shrieker summons a purple worm with its shriek, check for difficulty first. If purple worms would be out of difficulty, generate a baby purple worm instead.