How to easily remove acyrlic overspray or mistakes?

Tamiya acrylics are solvent to Windex or anything containing ammonia. That should have little or no impact on a cured lacquer basecoat...but as the instructions always say, "...test first on a hidden or non-critical area."

(In point of fact, I've even had success using Windex to clean 'fresh' Tamiya acrylic from older and fully-cured Tamiya acrylic...but it takes patience and a light touch. On lacquer it should be a breeze...but the 'minimal' amount required is always best.)

I'd suggest that you mask closely to the molding with fine line tape or Tamiya white tape.  Burnish down tight with a toothpick. Then brush or spray the trim, and unmask.