I can’t really speak to the particulars of SSF nightblade builds, though something like this
seems pretty fun.
As for Vit Ritualist, things should work out just fine. Bonespikes (https://www.grimtools.com/db/items/8468) are great for leveling, and like Conjurer, you can shoot for Dark One set. If you’re looking for a concrete weapon to farm while you wait for RNG to gear you up, you can build around Nightbringer (https://www.grimtools.com/db/items/13865, albeit at a 2.4% drop chance) towards something like this for example:
As you get more loot, a number of other nice gearing choices will become available to you as well.
Since you’re looking into Ritualist, you’ll probably also be interested to see
As an aside, I should also mention that since you said
that Conjurer Primal Strike leveling is pretty comfy if you’d rather level Conjurer another way.