I wouldn't be confident that no staining will occur.

You may not need a sequestrant, but go ahead and lower your pH to 7.0 - 7.4. Avoid adding "alkalinity increaser" (sodium bicarbonate / sodium hydrogen carbonate). Do NOT add calcium hardness. Use borax, not pH UP (soda ash / sodium carbonate) to raise your pH.

Raise your chlorine GRADUALLY over a couple of days, and run your pump & filter continuously.