Not a bad idea MS. All my rifles that have iron sights, either ML or CF and the sights don't interfere with the scope, I sight them in first before installing the scope. And just for the reason you mentioned. However, in all the hunts I've been on I've never had a scope crap out on me. But its nice to know that you have a back up sighting system just in case.
Senility has been a smooth transition for me.
When you're dead you don't know you're dead. All the pain is felt by others. Same thing happens when you're stupid!
With God by your side your stumbling blocks become stepping stones.