So you want to roleplay a noble and honest character but you do not want there to be an economic downside to your choice? If you don't want your characters moral decisions to have any consequences, why do you care about them?
(Also, even if you want to be a "good guy" you can still just rob the keep. The magisters make themselves scumbags enough for your roleplaying sensibilities to not haveto worry about their feelings. There are a good couple of thousands worth of paintings in the keep.)
