i don't really like the base idea, it really seems a dwelling...
but what about this: a place in the clan hall, accessible from any country. there's space for ten players, and logging out in there costs 200 gold each time.
it can be attacked only by people within 5 dks than the strongest person sleeping in there. you don't know who is in there when you attack.
then, you'll have to fight a random player of those (it counts as a pvp).
this is just a suggestion, i didn't even have time to think a lot about it
anyway, i tried to make this as fair as possible, tell me what you think, and if this could work, being modified a little (or a lot)