Here is a random idea I just thought of....
Put a mirror across from your toilet.
Not a full length one. There is no need to get that intimate while doing "paperwork". However something that sits about shoulder height and up can be beneficial. It's like having sex in a public place. You'll get used to it. (and there is less of a chance you'll get arrested)
This will help you in two ways:
I. you can work on your facial expressions which are very important when it comes to performing and conveying emotions. Far too many performers don't know what to do with their face. This will give you the chance to work on it.
II. It will get you more comfortable in awkward situations. If you can maintain eye and make faces at yourself with defecating, you can do most anything. Getting over those feelings of embarrassment are part and partial to being a good entertainer.
Besides, it's not like you're going anywhere...