Finally got a chance to try this. When I build and run the example scene with the old UIWebView source it works fine.
I then followed your instructions to remove the source files from the iOS folder and drop the .a file in that folder and it doesn’t work.
I get this output in the debug window of xcode:
InAppBrowserBridge:OnBrowserStartedLoading(String) (Filename: ./Runtime/Export/Debug/Debug.bindings.h Line: 48) 2019-09-26 16:04:48.806513-0600 espresso[13808:5005423] [ProcessSuspension] 0x281ef8fc0 - ProcessAssertion() Unable to acquire assertion for process with PID 0 2019-09-26 16:04:49.327990-0600 espresso[13808:5005524] [ProcessSuspension] 0x281efabc0 - ProcessAssertion() Unable to acquire assertion for process with PID 0