Feeding cables through small gap

I am in the "planning phase". I have been up in my attic exploring the areas where the cables will be routed. The biggest problem seems to be the area from about six feet in toward the center of the attic to the area where the cables will be fed through a drilled hole in the outside fascia board. This area is about a foot high at six feet in and maybe four inches about six inches in. The hole in the fascia board may be below the floor level.

I'm thinking maybe to run a rigid wire from the outside in until I can reach it from the inside. Then pulling some string from the inside back out through the fascia board.

Any siggestions??

TYVM!!