The only way to stop camping is to make it physically impossible to do so. Here's an idea.

Instead of trying to "fix" camping with perks or changes to the survivors' base kit, why not remove it entirely? Here's a relatively simple solution, based on the concept of Pyramid Head's cages (I think there's other games with this concept, but that's beside the point):

When a survivor is hooked, they go through the normal "screaming" animation, then are teleported out of the map and that hook is temporarily blocked by the entity.

Once they're gone, the hook timer starts as usual, and their teammates have to go to one of 4 "rescuing stations" (or whatever you want to call them - I'm sure the devs can come up with something) located in the 4 corners of the map. They're all highlighted to each survivor when someone is hooked, and interacting with a station will rescue the survivor.

The hooked survivor is put in something resembling a prison cell where they're still on a hook, and therefore able to self-unhook if you want to keep that option in. Upon self-unhooking, they'd automatically run out of the cell and appear at one of the 4 stations at random. If rescued, they'd run out of the cell and appear at the station they are rescued from. If left alone, they're still on a hook, so the sacrificing process would happen as usual.

Any of the 4 stations will be accessible, so even if the killer tries to camp, the survivors could just rescue from another one.

The hook used will be unblocked once the survivor is rescued. On their third hook, they will still be sacrificed and the hook removed as usual. Any perks relating to unhooking can still work. Camping will be literally impossible, though tunneling could still happen (albeit harder to do immediately in most cases).

A few issues with this idea can arise, so here's some solutions:

• Co-ordinating rescues: All stations are highlighted for the survivors, and any survivor within a certain range of one has their aura shown to other survivors.
• Survivors preemptively running to the stations: If survivors are within a certain proximity of one of the rescuing stations within the first 10 seconds of the hook action happening, that station is blocked for the first 20 seconds of the hook stage (numbers could be tweaked, of course). This prevents early rescues, which could be unfair. The killer doesn't see that a station is blocked.
• The killer attempting to camp a station: Self-unhooks would prioritize a station away from the killer. If a survivor rescues someone near the killer, the rescued survivor still gets the haste and endurance we currently have, regardless of proximity to the killer, so tunneling will still be more difficult. Kindred would show killer auras near the stations instead of hooks.
• Maps with multiple floors: 2 up, 2 down, at random. They're shown to the survivors anyway so I don't really see this as a major issue.
• Aura reading: Add a few (5?) seconds where the hooked survivor and rescuer's auras can't be revealed to the killer upon rescuing to avoid rare scenarios where the killer could see someone being saved.
• The basement: Have it still there for the sake of hooks that can't be sabotaged.
• Endgame: Survivors will likely have to go for stations farther away from gates to make safer rescues. This puts a lot more pressure on the survivors, but honestly, rescuing in the endgame should be difficult. If it becomes a problem, just remove the aforementioned station-blocking mechanic when the endgame collapse is active.

Obviously, hook timers might have to be looked at, as well as some perks. I think Pyramid Head's cages could stay as they are without really affecting much. All of the interactions involving hooks would still be present, including sabotage, Scourge Hooks, and the like. The 4 stations would still make survivors get off their gens and potentially run even further away than they otherwise would.

There's some balance issues with this idea, I'm sure, but things can be adjusted around it.

At the very least, it could be a fun alternate mode to try out. I'm sure the devs could come up with some interesting new interactions for this mechanic, as well.