DownFlyer- Those disposable brushes oughta be perfect, and you answered another of my Qs by posting about the headlamp
I`m guessing your eyes are decades younger (or at least "much better") than mine, otherwise I`d be telling you to get a magnifying visor or somesuch (I use mine all the time).
I have a paint chip I am going to tackle today after I pick up a Fine Line Fluid Writer Paint Applicator Pen. Will also use my magnifying visor.