Eric, the clamped-on angle-iron fence is good, or you can also use a wooden fence.
I'd probably use two fences to really trap the cubes, and don't forget to use a wooden pusher, not your fingers!
I'd cut all the cubes one cut first. Then move one fence in closer to do the second cut through all the once-sliced cubes.
As mentioned earlier, orient the fences according to how the bandsaw wants to cut -- not necessarily square to the table. Your cut will wander unless you pay attention to this on a bandsaw. Do a test cut with a longer easily handled piece of wood with a pencil line down the center. If you cut to that line freehand and stop about halfway through, the wood will naturally have taken the right angle to stay on that line. Keep that same angle with your fence.
You do know you'll be losing width of your finished slices to kerf, right? Understand how that will affect the center piece vs the two outer pieces, when spacing your fence(s). The inner piece otherwise will be narrower than the outer pieces, unless you compensate.