Đere’s no escaping us, broðer.

Once upon a time, English both used thorn, the character you are replacing, and eth, the one I just used here. One was used for words like that, this, there, and the other was used for thin, thank, and throw. That didn’t last very long, linguistically speaking. The quickly became interchangeable, and thorn rapidly became the most popular one. But I think if people want to bring it back, we should bring them both back. And while we’re at it, we should bringing back the “four form system.” IE, we used to have two different ways to say yes or no, those two words were specifically used to answer a negative question. Current English leaves negative questions impossible to answer with a single word wothout ambiguity. “Will they not go?” cannot be answered with only yes or no in Modern English’s 2 form system. But with a 4 form system, we had yea and nay for general usage. “Will they go?” Yea means they will, nay means they won’t. But with the negative form of the question, “Will they not go?” Yes means they will, and no means they won’t. Over time yea and nay were both dropped and yes and no became universal.