Not ideal but they don't come with spare caddys unless u leave one out of systemYou could consider using hotswap with a 5.25 mobile rack instead if slotting drives in and out is feasible.
If you have 2x 5.25 bays spare, 2 single racks with power switches(some provide that) would mean never needing to pull one.
Yeah I knowAs stated, doesn't want a software option.