rust fix on hood hinge area

OK I have a question about what is going on and how to fix a problem of rust at inner fender where hood hinge bolts to it. Pictures attached. I know the best way to fix the thing is to replace inner fender with new piece. However the purple Cuda is an all original survivor (number matching AAR) and I don't want to do a restoration on it. It doesn't have any rust on quarters or fenders. I want to stop the rust from growing more. It has been in storage for like 7 years and the rust has grown. I checked under wheelwell and there is no serious rust showing and metal is sound (Good pull on magnet).
The hemi orange 72 challenger is in need of restoration and has rust on one side and other only has small spot.
Does anyone know a good way to fix this and stop rust from growing. I will try it on the Challenger first. Appreciate any help you can give. Thanks

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Author: 3406pk