All he has to do is wish it and Kenneth will go sailing through the window. ;) Illiendi isn't used to simply allowing his 'masters' to be insulted without serious consequences. 

As for the announcement obviously Kenneth can say he knew nothing of it if all goes wrong (there will be regular letters back after all) and if it looks like he's succeeding/its good for business then Kenneth can say it was all his idea to make the 'useless son' do something worthwhile for a change. 

Yay Illiendi can tame the savage man beast that is Kenneth! (Again he can also shut the windows then throw him out of them, all Amano has to do is think it with all his heart)