The Skiff would be your friend.
Look at this fit:
The important equation is not so much how many the gankers could bring if they grouped up with other players, but how many characters does a single miner ganker control. From what I have seen the current maximum is nine, so as long as you can tank that in an 0.5 system then you will be fine.
Assume 700 DPS per Catalyst, so that would be 24 seconds of damage before concord arrive, assuming a CONCORD pull was applied in your 0.5 system.
So a single Catalyst with perfect application would be 15,400, but assume less than perfect application. Say 90% which would be 13,860. So looking at the 116,000 EHP this Skiff could die to 9 Catalysts, but then again I have not taken into account that the maximum number of characters that this single player can start firing with within a server tick, which is five. If more are firing within the server tick they are likely cheating and you can petition your loss. But you would be really unlucky to meet that person, tends to hang around in Caldari space and has more of a taste for mission runners.
Do you want to know more in terms of other activities? Like hauling and using mission ships like Marauders.
PS About the five person per server tick, what happens is that the player logs are not always the same as the server logs so there can be false positives, but you have to question more than five characters run by the same person shooting at the same time. And contrary to the trolls telling you that you will be ignored, you will not be. After all CCP Falcon himself said that Eve has very few rules but it is beyond the pale to break the few that Eve does have.