EVE does not need “great safe zones” anywhere, least of all in wormholes
Giving the S-sized structure D-scan immunity would be even better than deathstar (revising what I said earlier). If it had to be scanned via combatprobes only, that would make it relatively safe. And it would be cheaper than M-sized. It’d get you going.
If there’s no small compression structure available, no one except super power blocs will be able to compress (and therefore mine) ore in lowsec, which is now required after the Mineral Redistribution Patch.