Of course. If it would work off the bat in a few minute's work, everyone's hard work here would be a joke. My point is that it seems that it can be almost entirely irrelevant why/when you enter, only how you exit. I'm sure someone has a strategy around this somewhere.
Notwithstanding the facts you fail to mention: yes, backtesting with Excel via Visual Basic for Applications is very doable.
Why bother when there are so many excellent platforms with backtesting stats already proven and vetted for accuracy ?
You'd have to ask the person I responded to. They asked if it could be done. I answered that it could. They didn't answer the "why" question; and I didn't ask as that information wasn't required in order to answer their question. But since you asked me, rather than them, I'll bite. One could be using a custom, (machine learning,) (or custom hybrid) type of model that can't be implemented using commercial software.
That would be the only reason, and it wouldn’t be a trivial task. If you can leverage a reputable .NET platform, you’ll be miles ahead.