I am not an expert with Blancpain but based on my experience with Rolex and Patek Philippe watches I would not restore the dial or hands of this watch . Never,ever.
I am not sure about the health issues with radium used on the watches in 1960s but I am sure you would be able to find some relevant info on line.
The dial makes the watch. If you start playing with it pretty soon the whole watch may lose a lot of the value.
HAGWE, Tom.