I think Wageslave is about right... There are very few N registered aircraft in Kenya, and even fewer that are available for self-fly hire. In fact I don't think I can think of a single one that would be available for hire. The only N registered aircraft are those newly imported/waiting for local registration or those being kept N registered for tactical reasons.
I really doubt that you will find anything for hire - self-fly isn't a big thing in Kenya. Mostly because of local regulations over licences, but also a lack of trust in who might hire your aircraft.
Your best bet if there is anyway to do a self-fly hire is to contact the AeroClub of East Africa at Wilson airport. They are best placed to advise, and would also know who amongst their members might be able to help...
Good luck.