something of note: as dingwall 6'ers get more expensive, their necks get thinner.
back-to-back compairing; NG, ABZ, and Z necks, the NG feels like a baseball bat.
if you could find a good used deal on a ABZ 6 string and are comfortable with the multi-scale, the neck will be noticably different from a combustion/NG2/3.
Have you tried out the LTD B-206SM? played one years ago in a shop and its neck has always stuck with me as slim, wide but not too wide, and easy to play. got no idea on the string spacing but after a quick search i found someone saying they'd installed a new bridge giving them 17mm spacing. the pickups and preamp should be easy to replace if you do that sorta thing and find the stock ones offensive, but they should be ok. it's 35 not 34 but to some extent, that can be partially solved with string selection.
another, more expencive, option would be Maruszczyk custom shop. if you dont go crazy with options you should be able to get what you want for about 2k (this suggestion might be null if you're outside of europe, idk what shipping and conversions and insurance would be?).
used post-2009 CS warwicks 'should' have a thinner (not 'the warwick' neck) profile by default. i believe the rockbass 6'ers have the same default. i've read somewhere that people have pushed the adjustable bridge out to 17mm on their warwick 6'ers - so maybe thats a possibility.