If you don't want a force PK, don't play or accept a CA that has a force PK system. Nobody is forced to accept becoming a draugar or wight.
Firstly, addressing that it encourages metaplay: I have never really seen, nor experienced, a draugar or wight asking a friend to hide it in a nation or vassal OOCly. Typically, phylacteries have always been put in hidden parts of lairs, and specifically for draugars the phylactery has to be accessible by said undead, since that's where they respawn (this was to prevent hiding it behind 3 iron doors away from the draugar.) I will say there were (and maybe are, idk I don't keep up) some necromancers that simply ignored this, but it is always up to the CA to read their lore, and let ST know when rules are being broken. Can't complain if you never did anything to fix it. Otherwise, I don't think there's much metaplay at all with phylacteries - they're made, and it's fully up to the necromancer coven / creator to move and hide their evil gem. It requires tact, thinking it through, and communication IRP, typically you don't have much OOC communication surrounding a phylactery besides "where'd you put it so I can respawn there" and thereafter getting access and keys.
This also is vastly better than old phylacteries. Physical builds require that the soul-harboring vessel can be seen, that ANYONE can interact with them. Old phylacs were just items in your hand, and were hidden in chests, never to be seen except when on the owner's terms - THAT was anti-rp.
As for your argument of wanting to take a break, perhaps getting banned, or otherwise leaving the server, that is completely fine. Being evil is hard on LotC, it's a constant balancing act of wanting to enjoy and flush out your character whilst also being one of the main centers of conflict for high fantasy EVIL. You are the drive behind holy mages wanting to act like holy mages, riding the fine line between a WoW raid boss that is a soulless loot piñata that jaded old heads will 2 emote 'smash head', and being far too invested in self-preservation and making every interaction feel like your enemies are wasting their time going against an endless nothing-story.
That being said, anyone who plays a character with a phylactery must accept that people can PK them. You can get banned, decide to take a break, get mad and smash it yourself, yet there are consequences to accepting the CA, and deciding to play it. It isn't anti-RP, it's a story, it drives the story to be a creature that can actually be completely removed from the world. I prefer things that are given otherworldly power, an edge over the common player to have negative effects - especially when playing an inherent villain that is there to make a story. If you don't want to have the chance getting PKed while taking a vacation, play a ghoul, darkstalker, archlich, azdrazi, unanchored ghost, paleknight, etc.
Plenty of dark mages and CAs will get killed and just respawn an hour later to keep up whatever evil plan they were doing. In my opinion, it's more anti-rp when I kill a mystic and I see them respawn a week later as the death did literally nothing - let there be consequences. You undertake consequences when you supercharge your character with magics, you can't cherish your character's vitality while simultaneously diminishing other character's.