Try Blue Chip at Wonderboom airport as well. The field is close to the general flying area and has accomodation on site or accomodation can be arranged within a short distance.
June/July is the Southern winter and the highveld remains virtually cloudless over this period.
Another option would be to buy into a motor glider and then sell it on to the next person along or form a syndicate with a few UK pilots and use it for holidays and hour building. Sell your share to the next person who needs to build hours. The hourly running costs are about US$20-00.
I recently saw a motor glider for around US$20000-00 and a small biplane microlight for around US$8000-00.