Honestly, the safest one, can't go wrong with it. You'd be just saving yourself a lot of trouble, and like that you won't have to bend rules and try to appease everyone.
Objectively no go, no one wants to be in the same boat with the cult of personality Mark loyalists at kikechan and, judging by the asshurt replies on the thread you made there, it's clear their delusions of grandeur have melted what was left of their rotten reddit brains, and that they don't want to be with anyone else either.
This could be doable but I fear it might be recipe for huge disaster. I don't mind any of the webring boards since none of them have shown animosity towards each other. I personally only browse /geimu/ and I've never seen anyone there shittalk zch/v/, smug/vg/ or anteres/v/, then on the other end of the spectrum you've got 8moe who's been spreading D&C from day 1 when fatchan was still alive with Mark being a pioneer of it, up til the present day, still spouting lies and slander about the webring and every other /v/ alt on it. If you allow any of the webring boards AND 8moe you're just asking for the chat to be filled with a massive fucking shitstorm of anons calling eachother kikes, niggers, pedos, feds, reddit, and whatever from start to the very end of the event without any pause inbetween, shitting each other's site in retaliation to losses or whatever, and constant bickering about who should be crowned The True /v/™ likely sparking further conflicts and drama. All of which is definitely not a fun or comfy prospect.
>Screw 8moe: they are NOT part of the webring, in fact, they HATE the webring and not only are they very loud about it, they're still making up bullshit about it to this day. However, this, much like option 2, would probably still cause a big ruckus and major butthurt.