Zman, I cheated and looked your LOR Forum post. It says that Madrix uses four "reserved" DMX channels.
If that is true, then the answer is for Madrix is: No problem (unless, perhaps, you are using LOR's iDMX converter. If so, I'm not familiar with it)
As far as outputting from the FalconPi in LOR Protocol, that has been done in Test versions using a USB RS485 interface but I don't think the Current Release version is doing that yet. (one of the developers can update me on that)
If you were to run 100% DMX, the answer is definitely: No problem
Quote from your LOR post:
LOR Channel Config:
Madrix Storage Unit - DMX Universe - Universe (x) Channel 1
Madrix Bin Number - DMX Universe - Universe (x) Channel 2
Madrix Cross Fade - DMX Universe - Universe (x) Channel 3 (in my case the lease used if at all)
Madrix Master Fade - DMX Universe - Universe (x) Channel 4