Just say what you said in italics minus the ass. Simple as that. Firing a client because they don't want what you want... that's certainly an approach. Same one my eight-year old tries. shrug

Regarding fonts/blues: impossible to know because no clue what it looks like. In some situations clear font differentiation is critical. In some situations, med devices need to look similar to existing devices to maintain familiarity. In some situations, it might look like ass, but be more functional than a pretty version.

Is that the case here? No way to tell.