Those ones excellently painted in Kaki are really lovely and, in my option, more iconic than to have them painted in grey-green.
I may add that It’s understandable to prefer to have them painted in tropical dress because the only well known action and true moment of glory of the san marco marines of the Royal Army was during the failed attempt by British forces to conquer, trough a combined big raid, the port of Tobruk (Operation Daffodill, September 1942) in which even if betrayed and surprised by enemies disguised as German allies , and even if armed only with their personal weapons ,they cornered , kicked in the ass or captured the quasi totality of Allied superior forces including the elite SAS or LRDG troops that had even executed, during the night, at cold blood some surrendering Italian carabinieri guards. The British official history , as usual when Italian soldiers should be represented , avoided to praise or even mention the San Marco and instead told only about German defenders which is untrue as the only ground German units in Tobruk were few FLAK or medical ones.
On the other hand even some grey green clad San Marco Marines could find a place in some historical scenarios , but only during the RSI period when they faced partisans and Brazilian/US forces in the mountain ranges of central Italy together with German Mountain troops ..even in that case they were successful during probably the last offensive carried out in the west by Axis forces (Operation Wintergewitter, December 1944)