GREAT question! I had thought of this myself, but had not taken any action. (So, THANK YOU for this new topic!)
For those who may not know what this "RS-918" is all about, it is a pocket-sized 10 watt HF ham SDR. There is a user group as seen in the following link, where one can learn more about this fine unit:
The RS-918-PLUS has been around for quite some time, and as a result, the basic model is quite mature. -And it continues to evolve, as the FIRMWARE continues to be updated as the firmware is ongoingly improved. (The FIRMWARE "is the radio," to summarize...)
I have the SD card for the RigPI on order from MFJ, and of course, it is on back-order at this moment. -Not at all surprising, as the MFJ-1234 is quite an exciting item! My original thought was to use the MFJ-1234's SD card to couple my Raspberry PI to an IC-7300, but the possibility to use this same device to control the RS-918 is very exciting to me!
73; Mike, K0JTA