I’m not sure a 468 from a 480 will be an issue for your type of riding. The head angle is 68 and going 12mm shorter might add 1/2*(???).

You can always put a zip tie on the bottom of the stanchion and see how much it moves up (sag) when you are on the bike. Riding a short distance on a really smooth surface will be the best reading of how much fork sag with the way you normally weight the fork.

John