There seems to be a lot of gunsmiths that won't (can't) do anything but a 700/700 clone.
But it's not impossible to find someone who will rebarrel a CZ 557. I bet someone like Mark Gordon (Short Action Customs) or Chad Dixon (Long Rifles Inc) would take a stab it. Also, CZ-USA has a custom shop that without a doubt can put whatever barrel you want on it.
I looked into them when they first came out. (I contacted CZ at the time)
I really like CZ products.
The urban sniper was nothing but a varmint kevlar, with the barrel cut back and a surefire brake installed.
The price was substantially higher for the urban sniper and, to me, not worth the extra coin. it didn't help that the surefire brake was completely useless to me.
I ended up going another route, but the do make nice stuff.
Personally, I would look at the Varmint Kevlar (if they still make it) and have it cut back.
This rifle is exceptionally hard to find anywhere. I just ordered one tonight for an excellent price from riflegear.com. Once, I get it out to the range I will let you know how it performs. Interesting rifle kind of a niche gun if you ask me, but I’ve been wanting to get myself a short handy midrange tack driver. I’m hoping this does the trick.