That’s the kind of suggestion only people who never smartbombed anyone will give. Smartbombs cannot be activated in the immediate vicinity of wormholes, so you need a prodigious amount of characters to surround the hole and try to do it that way. It’s wholly impractical.
The people who told you to try to harass them out or seed multiple C13s gave you the best advice.
However:
This sounds like your corp is ripe for moving to a hole that has a rollable static (where you can run sites infinitely in theory). Consider some a C2>C3/HS, that will give your indie friends logistics, and give you access to sites. C4 variants that don’t include C1 statics are a good idea too.