The setup we've been using on the 457 Scout seems to be working well. It's pretty well a bolt-on with very little fitting.
I already had the Redfield International rear sight (approx $200 on eBay) when I bought the rifle, so looked for an adapter. Champions Choice had one that fits the grooved receiver and adapts to a Redfield-type mount, at
REAR BASE FOR ANSCHUTZ TO ACCEPT REDFIELD REAR SIGHT | Champion's Choice . This is very similar to a Savage-Anschutz SA-1411 which I found on eBay for around $50. I actually have both now. I bought the S-A first because Champions Choice had theirs on backorder, then the CC came in. Both type works, the S-A is blued and a little heavier, the ChampChoice is matte and a little lighter. Per the Champions Choice website, sights by Redfield, PNW, Zelenak, Swenson, and Warner will fit this adapter. The Lyman #90 MJT looks like it will fit but actually it will NOT fit. A Redfield 75 sight will NOT fit this adapter, has different threads (although if you are handy with a drill and tap I supposed you could make it work).
Another alternative to the Redfield-type sight might be a used Anschutz sight like this one listed on eBay
https://www.ebay.com/itm/Anschutz-T...168228?hash=item265b0a7124:g:96cAAOSwKX1gPpwc (two hours till the auction closes) at around $100. Hint: When looking for sights on eBay, use the search terms "micrometer sight" or "diopter sight".
For the front sight I removed the CZ sight hood and used the sight-blade adjusting screws to drop the blade to it's lowest position. It still sticks out a little so instead of removing it completely I chose to file a narrow slot in the base of the replacement globe sight, using the narrow edge of a file. The globe sight I used is a used older-model Anschutz 6522 off eBay, was misidentified and I found it for $35 delivered. Looks like this:
https://www.ebay.com/itm/Used-Ansch...830380?hash=item343e053e2c:g:tGkAAOSwgulgRqZ7, or
https://www.ebay.com/itm/Anschutz-f...582472?hash=item4219604a88:g:SHIAAOSw4sVgL1bJ. This globe snaps over the CZ front sight ramp and can be tightened down. It tightens from the bottom of the sight with a claw, rather than at the top of the dovetail like a Redfield, if that makes any sense. A Redfield Olympic/International globe front sight wouldn't clamp down on the CZ ramp. I'm told that Centra offers a globe front sight that will also fit the CZ front sight ramp but I could never find one in stock anywhere.
After mounting the Redfield International Rear sight I found it wouldn't go low enough to match the Anschutz front globe so I moved the aperture holder on the horizontal arm of the Redfield from the top of the arm to the bottom of the arm. A Redfield Palma rear sight would not work with this front sight, wouldn't go low enough and the aperture holder was already on the bottom of the horizontal arm.
For a rear aperture we are using an old Merit adjustable rear aperture, which I already had (again on eBay, approx $100).
If I had bought all these sight parts originally, rather than having been given the Redfield rear sight and the Merit aperture, there would be more invested in the sights than in the rifle. Funny how that works. (Summary: Redfield International = $200, Merit Aperture = $100, CZ to Redfield Adapter = $50, Anschutz Globe = $35, Clear Insert Set = $30, total $415 vs CZ 457 Scout at $325)