I am pretty sure they weren't Harvards. They were tail draggers, had a bubble canopy and were very noisy. They were also in natural metal finish but I was young at the time and could be mistaken.
Don't remember the Rapide crash (we left in '63) but do remember the Lufthansa 720B that came in one night and woke up the whole town using its reversed thrust. The most exotic visitor I remember was a French Vautaur. Actually, I once suspected the perfidious French for the P-47s but they retired theirs after the Algerain war.
Are you aware of Malcom Macrows's web site ?
http://www.mccrow.org.uk
He has a very good section called "East Africa 50 years ago" which contains many photographs from Entebbe airport.