Do you have any epoxy sitting around? Bar/table top or the like? You could prop up the bulkhead side of the tray by an 1/2-1” and pour in any type of hard setting acrylic or poly so it pooled against the opposite end wall and made a sloped floor, it wouldn’t take much of a grade to drain fully, just a couple degrees.
Alternately you could just raise the table six inches or so and and angle it slightly in the process, then install a vertical gravity drain?
Either way whenever I’m drilling OSB or other engineered materials I like to put a layer or two of painters tape on each side before drilling to reduce face damages from chipping