@warner Thanks for thinking about using my plug-ins. 😊 On top of mind, I can't think of any significant side-effects with custom themes.
And they are easy to toggle on and off. So if it goes south, you can just disable the custom theme, and everything will be back to the way it was. So, it's relatively risk-free.
Email obfuscation is definitely on the to-do list, but I don't know when I will be able to work on my open source projects. Right now, I have to prioritize my paying clients. But, usually, I will get some time off during the summer and winter holidays.