I've got Sparky working. I compared the Sparky Makefile and pios_config.h file with those of the DTFc target, which I've been flying. I made Sparky "look like" the DTFc board wrt the modules and functions that were included, with the exception of leaving the MS5611 enabled in Sparky. Rebuilt the firmware with those settings, and it now runs.
In a nutshell - added LQG control to Sparky, removed all the navigation functions.
If the community thinks this is a good solution, I'll cut a PR for this change. I suspect the same changes would get the Piko Blx target working to.