YES I did while travelling for work.
No solution for iOS, so definitely Omni should provide a built-in feature.
For Mac, the solution is a script, but I don’t know if it works for OF3. https://support.omnigroup.com/of2-due-times-applescript/
If you haven’t already, I encourage you to email the Omni Group at omnifocus@omnigroup.com to request support for time zones. I agree that this would be very helpful, especially for those of us who travel internationally.