Wow. @Doitsu, you are making it really pain-free for me to slide in to the world of Sigil plug-ins.
At the moment I'm swimming in thousands of lines of Python code for a
Spanish conjugation flashcard project I just released, and next week I have a big exam. But definitely saving this for later.
The first step is always the hardest, and it's tremendously helpful being shown a full working piece from where to expand.
Thank you, and hope the rest of your week goes well.