nightlight, thanks for responding: I had dialed through all of the possible Output settings and just landed on that one when I finally gave up. I do generally use the Stack setting and add Effects in my DAW. Reamping will work on either of these settings, though-it's just that you convert analog to digital when you don't even need to, if your signal's loud enough, so why do it? If I understand, I believe that was your question.
I figured it out! It was a routing issue on two points:
1. I have my Focusrite S/PDIF out settings on DAW 5, which means that you count down 5 outputs in the Outputs of the I/O sections (counting each stereo output as two, a mono output is one, etc.) and drop the Reamp Output in there at position 5. Just because it's set to DAW 5 in the Focusrite Scarlett mix software. So, the new screenshot of Input Settings shows the Reamp input in the correct position.
2. I had the Profiler L/R Input routed on Analog 1 and Analog 2, instead of S/PDIF 1 and S/PDIF 2, as can be seen in the screenshots.
Nothing was wrong with the Bus settings, although they do need to be weeded out a bit.
So, it would've been that the track recording the reamped signal was looking to the Profiler Input, which was never actually receiving a signal from the Kemper's S/PDIF. I knew something was up when this morning, I hit the PreFadeListen button in the Focusrite software, and I could hear the reamp, just like yesterday I could hear the reamp when I ran straight from the Kemper into some monitors.
Thanks again!