Choice of bachelor's thesis (applied math)

Bachelor's thesis is coming up next semester and I've got a dilemma.

I was originally planning to do a standard project (most of them seem very soft to be honest) and then take an extra course (I got permission to take a PHD level course in information theory) or two simultaneously.

But then a project involving a fairly novel part of control theory popped up, novel enough that it might be possible to get something interesting published from the project. It seemed like a fairly interesting problem and the possibility of co-authoring a paper at this stage is very appealing as I have an eye on a PHD after my masters degree.

Control theory itself doesn't interest me that much, but the tangential mathematical subjects do (optimization, algorithms, information theory, etc). The problem is that it's probably going to be a lot more time consuming than a normal project and I don't know if I'd benefit more from it than just taking another course in an area I'm actually interested in.

I'm nervous it's going to be a stressful spring without much to show for it if we don't manage to get any interesting results at all. On the other hand, I suppose any research experience is positive even if it's not in my main interest area.

So, the question is: research-based thesis tangentially related to areas of interest, or normal thesis focused on my areas of interest plus additional courses in my areas of interest?