I have several of those adaptors because so many of our appliances come with European plugs on them! They are very widely available. I bought one recently in Pick 'n Pay, a big grocery store chain, for about ZAR110 (which I thought was rather expensive actually - but haven't compared). In many hotels the bathroom will have a shaving plug which takes the European plug pins.

I have only this year received my first ZA chip & pin card. All my others are still without a chip (but will presumably have one when they get renewed over time). So no problems at all using cards without a chip.