Airworks at Wilson are a ZS approved AMO. The operation side of things is probably not possible. I know that Kenyan AOC holders acn apply to operate a foreign registered aircraft within Kenya underr exceptional circumstances for a max of 3 months. However, I dont know about private flying etc. With regard the pilots, they would probbaly have to be Kenyan or have Kenyan work permits. De reg/re-reg, probably the best bet if it is for a long time.