I've thought about this idea as well mattpitts74. Haven't seen anything in writing or on YouTube. Heard that a "Billows" fan may fit on the Joe JR without the adapter (which I use on my Classic with the "Billows" fan). If I can find the time to try it out, I'll post a response.
BTW, to use the Billows fan, you have to use a certain type of temp controller (listed on MFR website). Currently, I use Signals as my temp monitor.