Interesting. I've played around with independent transformers for now (each with 1 prop), and just programmed them to move the next prop when the initial prop reaches the end. I also made sure to show/hide props so that it looks like one single cube is moving through space when in reality there are 3 cubes with different routes. The downside of this method, however, is that it requires multiple props and events, which can be troublesome for map management and maintenance.
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Oh, this is nice. I assume you can just nest transformers almost infinitely, having a single prop go through complex routes as a result. Very cool!
One weird (and pleasant) thing I've noticed, is that transformers can somehow combine route movements and make props travel in unexpected ways. For example, here I have the 3-level transformer setup, and when going from end to start (2nd transformer, after messing with 1st coords), instead of moving directly (with rotation applied), my cube does this wide turn thing. I kinda like it, even though I have no idea how it happened.

Shows that there's a lot of hidden potential in these functions, but it's not that easy to uncover.
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I think I'll be combining these two methods (independent transformers + nested transformers) to create some interesting prop animations, but I really do hope that the developed animation sequencer will make my life much easier.