One solution (simple) would be with drawing some emoji instead of using a progress bar:

(note that formulas are incorrect there, Sequence(1, x) goes backwards when x < 1 and draws two items if x = 0.

Another solution would be with rectangles. It’s more complicated to implement, but more flexible (e.g. you can color-code your band members and see team staffing at a glance):

To think of it, you can use different emoji too. All solutions would require a formula of a sort, so just see what’s easier for you / good enough.