Edit: Added script for shuffle block as well
I think this is the coolest way! No map, no custom blocks (except this one of course).
But in 6.6 (now in dev) reverse is a primitive. :~)
Yes.Hyperblocks!
Yes, but then this happens:
Oh. Yeah. That's because NUMBERS FROM works in big-to-little order (as well as little-to-big). In the APL library there's a version that reports an empty list in that case.