Unless I missed something in the Bass NW ad, that S2 appears to have a full-sized body. It doesn't appear to have the elongated top horn Alembic has made for a long time on the traditional Balance Point shapes. Others probably have experience they could share with how well a 34, 5 string neck balances against a full size body.
However, the K shape developed out of a different (and maybe more severe) problem. It is a design solution to balancing a 34, 5 string neck against a 3/4 standard body. There seems to be little disagreement that the smaller bodies (3/4 and small standard) don't balance against heavier, longer necks as easily as some folks would want.
If the Bass NW S2 appeals to you, I'd seek more perspective from Club members before giving up on it. It's a real looker at a pretty good price.
Bill