To reply my own question: yes, this also works for the MSO2072A-S. Although the 300MHz key doesn't upgrade the bandwidth. The 200MHz key does everything it promises.
The rigup tool provides me with 4 keys: NSEH, NSER, NSEQ and NS
FH.
This document says the rigup tool should output these four keys: NSEH, NSER, NSEQ and NS
8H. Is there a way to get the NS8H key?