I did some short test with Gqrx remote interface: Setting LNB LO take no effects to rx frequency. Only the displayed rx frequency changes. Setting new rx frequency via remote interface works fine.
If there is a drift so we can set the new rx frequency at first and then set the new LNB LO frequency.
I could not hear any (disturbing) clicks during changing the rx frequency. For SSB/CW i think this will be ok.