I actually wondered about testing with extreme ranges in another comment, but this testing is done "offline" (Not on live routers and not in response to current

I actually wondered about testing with extreme ranges in another comment, but this testing is done "offline" (Not on live routers and not in response to current circumstances). However, at least how I read it, your comment was about testing rules in consistently in dev -> staging -> prod when you create one which I think is not viable in this situation since you are on a very tight deadline with immediate impact on your customers.