Robert, there are two men that served in 1st Kitchener's Fighting Scouts (one as an officer [Lt] and the other as a trooper and later FQMS 791). The officer went on to serve in the BSAP as a trooper 386. His second initial is H. On the nominal roll his name is given as Lt Robert Henry Walker. This man didn't seem to get the KSA so I have my doubts about him being a match. 791 FQMS Robert Walker was entitled to the KSA. There is also an entry with a question mark saying Rhodesian FF. This man had QSA with Rhodesia, TVL, OFS and CC clasps. He also seems to have possibly gone to the Coronation as there is a note on the nominal roll saying 'Coronation'.
Hopefully another member might be able to come up with more.