Meant to post this a while back, but never got around to it, and a PM just prompted me to do it now.
The goal was to use a pair of Vark extension tubes & a couple adapters + Schoeps SGC clips to get a Kwon style bar, but with an adjustable angle. So materials are just 2 Vark Bars (2 x $49.00 = $98), one Female 3/8 to 5/8" Male ($3.95), and 2 Schoeps SGC clips ($22 x 2 = $44). Total cost = $145.95.
Parts - there are also the 2 Vark risers & another adapter pictured that are not used.
Insert the adapter into one of the extension tube ends:
Mount clips on studs:
Screw the 2 tubes together, using the clips to make sure the alignment is correct. This is where it's a little tricky, you will have to fidget a bit with the adapter to get it right, but it's not that hard.
In the Donut:
from above (bad pic)
With caps in:
Spacing is about 25 cm.....
.....which led me to replacing one of the extensions with a 5/8" female to 3/8" male adapter. I only had a silver one, so it looks ugly, but spacing is closer to 20cm.
The other benefit is you can hack down the spare Vark bar to a low pro X/Y mount. I did not actually do this, this is MS Paint'd for your viewing pleasure, but you get the idea.
So in the end, you have a Vark bar, a ~ 25cm spaced adjustable angle bar, a ~20cm spaced adjustable angle bar, and a low-pro coincident mount (and a spare riser). Not bad IMO.
Side note- the 2nd vark bar I got was different than the first. It's slightly larger & has more squared edges. Pic:
Top = old, Bottom = new