I don't want to burst your bubble about your friends but 10yrs my friend is a long time.
If you are coming in August, I suggest you wait until then to see what kind of friendship you will have until then.
Yes you can sell your property without being on site. But it carries huge amounts of risk. Come back in August,go straight to a lawyer and get your things in order including who you're going to pick in your power of attorney. You can spend this time trying to figure out who's a good attorney.
Please remember this is Kenya. Things happen. I have personal experience in this matter. I also have a few friends who can bear witness to what I've just advised.
One of them was "building" a five story apartment complex. Trusted family and friends. They bought a piece of land. Nice building, updates and even pictures. On coming back, found out that the building was not on his kaplot but on the next plot which his "trusted advisory team" had bought.
Needless to say that this really is Kenya and his case went nowhere.
Come back and get your things in order. Don't you dare trust anyone who's children you can't kidnap and extort, especially if you are 10yrs gone. Be safe and you will be happy.
Jose: If I make it through this thug life, I'll see you one day. The Lord is the only way to stop the hurt.