There might be some type of header that fits over the drain supply pin, but that would not work on the ground lug. Honestly, I like your idea, especially since you never have to worry about a clip-leab falling off!
That makes sense! How about if you test some samples at peak power slightly about the requirement, left them on a hot plate, and saw no measurable change in S-parameters or DC current? Would that be a convincing argument?