No need to spoiler warning ;D
First thing. Bugs eggs is intended way to get copper. Diesel machines and bichamber don't use it in recipes, so if you switch factory to liqid fuel you will end up needing much lower amount of it (most will go into splitter and heating tower). Worth mentioning that calciner has 50% prod. So a bit more copper for the same ammont of eggs. You can also try second, harder recipe to add another step in biochamber. This way you apply building prod bonus 2 times.
Granades don't consume copper and works like charm. I think that's the thing you missed, and needed
I don't know if you landed on planet or go APS
but bugs also have 0 poison resistance so capsules are option as well. But worh mentioning that poison capsule don't dmg spawner
Finding spawner near some sort of island is also what I ended up doing on my save.
This might be a bit counter intuitive but eggs can be also burned in heating tower to void them if you can't smelt them.
Small boat also csn be placed on waterway if you need something fast with low cappacity
Getting copper is my favourite chain so far.
I plan to add floating leviathan corpse as water decorations, so you can find a bit more copper while sailing
I hope ypu find some of these tips helpfull