O.M.G.. I got it to work! The profile example had different cc values than the .toml, so I edited a few to match the .toml file and lo and behold, X-plane 11 responded!
One quirk, the cc set function in loupdeck live appears to send two values, you can't send just one. The first is in a dropdown list, the second is typed by hand. I assume that the first, having labels, are intended to make selection easier because the labels would guide that value, presumably specific categories of actions, while the second selects values within that action. In the case of CMidiCtrl, the commands appear to use only one of these values, so I selected 127 as the second value and x-plane seems to respond fine. It receives both values but ignores the second.
Seem right?
Next step will be to modify the spreadsheet that shows the B737 commands and select the cc values, types, and commands it for what I want to do with the Loupedeck, which is to control the knobs of the G1000. I have the Honeycomb yoke and throttle quadrants that work fine for most things, including the autopilot, but controlling the G1000 knobs with head tracking on and in real time (e.g. flying IFR with PilotEdge) is too much of a pain, as is changing comm frequencies. I have been dreaming of control knobs I can program and it seems that I can finally get my way!!!