At the moment, you can park a DL near selupan, and summon your party to gate, after it dies inside selupan.
If somebody comes to kill you, you switch character, and log back when you need to summon.
If that is done with a DL that has a bit VIT + DD set, its impossible to be killed.
Suggestion
- Add teleport to safe zone, after character switch, as it happenes during medusa fight.
- If that's not possible, add same mechanic that gens has, where, after somebody attacks you, or you attack somebody, warp/switch is not possible for X seconds.