Probe them down maybe - get scouts using combat probes? And only have scouts stay in the system dont jump everyone in until the safe is busted - ie scout has a warp in.
Obviously only works best if a POS isnt the safe
Scout mooches about in system - 100km warps on gates, scans for ships near gates and celestials, probes stuff down and so on.
Once has a positive hit they get a warp in. #group jumps in. Bubble all gates asap, some warp to cloaker on target and hopefully stuff of theirs dies.
Ideally, we need a common pool of safes across GW and beyiond to use foir scanning - 100k km off gates is a good start, so they jump in and hit a scansafe and go from there.
/justmy2pence