The itching goes away after a month, you say? Screw that! If mine ever gets longer than 2mm, it's because I've lost both of my arms or cannot get access to a razor, or both. It itches like crazy if I don't shave for a couple of days :/
Have you tried beard oil? I tame homeless beard with growth oil. At least they are no longer fluffy and messy, but become shiny and supple. I would definitely recommend unscented beard oils, and I really like them more than strong scent or strange beard oils.
Trouble when my beard gets too long the white is literally cats whiskers that can draw blood and there's all shades of brown, black, red and blonde. I go full tabby cat face.
I guess your avatar does not have the same life theosophy. I get fine fish bone like white hairs in mine
Some of my chin hair wants to be white, but the rest of my face wants to be copper, despite my hair being brown.