I think "Preview Release" inherently means no more advanced than beta, and why are you averse to installing one? (I never ran it, but OS X 10.0 was essentially a beta.)
I've run numerous betas with no ill effects (although I did have one close call), and it's bug reports from beta testers that generate ultimately (hopefully, fully) functional products.
I'm not savvy enough to do beta testing. So if something were to go radically wrong, I'd be up you-know-what's creek without a paddle. Noting again from their download page:
"DNSCrypt is immediately available as a technology preview. It should work, shouldn't cause problems, but we're still making iterative changes regularly."
I'll wait for the alpha version.
