Multiple CZ Accushadow owner here.
Not sure what you mean by a "10x bushing". Of course, there's a lot of things I've not heard of. But the Shadow 2 doesn't use a bushing at all as I recall, it's more of a bull barrel lock-up. So there'd be a good bit of machining required there, IMO. Personally, *I* would doubt there'd be enough improvement as to off-set the cost.
If greater accuracy is your goal (which is mine also, truth be told), you might want to consider acquiring an Accushadow. I can assure you these guns perform what is simply amazing accuracy. All their test targets are nothing but one ragged hole. They're a bit too large for carry purposes but that's not their design intent.
I believe it's been discontinued, but my fav is the Accushadow Lite. It's slide resembles a big brother to a Browning High Power, much lighter on the front end thanks to that.
I might suggest you nose around a bit on the CZ Custom web site, see what's currently being made. Then ease over to Gun Broker to see what they're selling for in the real world. There's a dealer in Nashville that carries more CZ's than anyone else, The Gun Crew. (615) 294-5806.
Now, if you REALLY want to get addicted, check out the CZ SDP on the Custom web site. It's the custom shop version of the SP01 Compact. Amazing trigger, melt job, super accurate but built for carry due to size. As of two weeks ago The Gun Crew had one of those in stock. If you finger bang it & dry fire it, I'd doubt you'll hand it back. LOL!
My .o2