Fallback to hsb
Yes, definitely. Speakers of Lower Sorbian should generally understand Upper Sorbian way better than English.
I am not a native. I have never lived in Lusatia. However, I think this is a very good idea. A native speaker of one language probably should have some contact with the other language, as there is one common organisation representing interests of Sorbs as a minority in Germany. I cannot remember any case of a translation being offered when in a radio/TV programme a speaker of the 'other' language was interviewed.