Maybe it would be easier instead to focus on gfx displays so no floats ever have to
be transmitted, but rather, only integer screen coordinates.

Say you wanted a clock face with hands you could send the coordinates of the
point you want rotated, and the angle of rotation, the coordinates of the origin,
and the chip provides the new coordinate integers.

I know there is a clock example here, but without looking I'd say a number
of points about the clock face are pre-defined.
I'll bet it cannot currently have a sweeping second hand (for example).