No, no, no, you can't have wand and shield - it would look silly - it would be like dagger and shield. Shields go with swords or axes.
Inquisitors should use a staff and touch spells only. Well in my vision of them anyway - perhaps I have no imagination.
I mean, consider the following ; if it works, it's not silly. And trust me, boy does it work.
Also, dagger and shield does make sense, you're more focused on defense than offense and when you do attack you're likely trying to penetrate heavy armor (In real life, daggers and piercing weapons were the bane of heavily armored folk) or trying to focus on attacking vitals.