The park tool squeezes rollers together so the quick link comes apart ,..

Maybe you can manage that with ordinary slip jaw pliers, IDK your resourcefulness.

chain breakers press out the pins from the chain. so thats a different thing.

if standard 6 then older 3/32 chains with the pins protruding , may be OK
7 in the space of 6 made the flush pin part of the width reduction .